津波避難経路の安全性向上のためのブロック塀対策の取り組みと課題について  [in Japanese] IMPROVING TSUNAMI EVACUATION ROUTE SAFETY WITH CONCRETE BLOCK WALLS : INITIATIVES AND ISSUES  [in Japanese]

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Abstract

津波避難経路の安全性を高めることを目的に,南海トラフ巨大地震津波によって震度7,津波高5mが想定されている徳島市津田地区でブロック塀の安全点検を行った.その結果,総延長約100kmの道路に2,048件のブロック塀を確認した.また震度7,液状化などで全てのブロック塀が倒壊した場合には,6%の道路が閉塞されることがわかった.そこで,住民に自宅のブロック塀の安全点検の希望者を募ったが33件しか応募は無かった.この一因には,日ごろの近所づきあいへの遠慮もあることが示唆された,ARCSモデルを用いて,今後有効となる対策について考察したところ,(1)まず児童生徒の通学路を指定し,ブロック塀対策を行うこと,(2)安価なブロック塀の対策方法を示すこと,(3)塀と周辺とを配慮した場合に創出される景観を仮想体験してもらうことを提案することができた.

 Safety inspections of concrete block walls in Tokushima City were conducted with the aim of improving the safety of tsunami evacuation routes. The results showed that there are 2,048 concrete block walls in the area, many of which would collapse in the event of an earthquake with a seismic intensity of 7 (on the Japanese scale), potentially blocking 6% of roads in the area. Meanwhile, there is little appetite for safety inspections of concrete block walls around citizen's homes, which may be partly due to concern about day-to-day relationships with neighbors. Future measures were considered using the ARCS model, and this made it possible to propose the following: (1) first, specify the routes for children going to and from school, and implement concrete block wall measures; (2) indicate low-cost block wall measures; (3) use virtual reality to allow people to experience the landscape that will be created taking into consideration the wall and the surrounding area.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_421-I_426, 2018

    Japan Society of Civil Engineers

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