深度500mの立坑を積み込み機一体型自由断面掘削機で掘る: 幌延深地層研究計画地下施設

摘要

積み込み機一体型掘削機による掘削開始後は， 設計どおりに機械設備が稼働し，掘削能力が発揮 されるか評価していくことが，安全かつ合理的に 立坑を掘削するうえで重要な役割を担うことは言 うまでもない．評価の実施に加え，各種懸案事項 を解決しながら掘削を進め，本機械設備の有効性 の検証を行い，後に実施する西立坑の設計への反 映や今後の立坑掘削技術の発展に寄与する技術を 確立していく予定である．%In the construction of the underground facility planned by Horonobe Underground Research Center in Hokkaido, three vertical shafts of approximately 500 m depth have been constructed for research and development on geological disposal for high-level radioactive waste. From among the three, we adopted free section excavator to the ventilation vertical shaft (inner diameter ø4,500 mm) for development of vertical shaft excavation technique. This report introduces the process of selection of vertical shaft excavator, which has not been used before, and the free section excavator combined with grab loader, and has summarized the current plan and future problems.