困難な施工条件の下で実施した営業線鉄道トンネルのリフォームの一例について

抄録

The Shibuya-Tunnel of The Keio-Inokashira-Line, L=270m, was constructed about 60 years ago, and because it has been deerepit remarkably, recently we carried out the reform of it for about three years.
This report explains the illustration of the active railroadtunnel reform, especialy in respect to safety and labor saving in spite of it was depended on human power. First main point we want to say is that the mechanization of the mortar chipping down work at the upper part of the tunnel, and second main point we want to say is that the automatization of the assembling arch support work.