開削トンネル・各種基礎 (1)

[VI-884] New approach for improvement of BCH (Bottom Circulation Hole) construction method (2) ~study for improvement effects of drilling bit by model tests~

*Taisuke Sanagawa¹, Masayuki Koda¹, Tadashi Yoshikawa², Kenji Hashidate², Shinichi Tajima³, Yusuke Ide³, Jyunichi Sekiya⁴, Kazuhiko Komatsu⁴ (1. Railway Technical research Institute, 2. Advanced Construction Technology Center, 3. Kajima Corporation, 4. Cemical Grouting corporation)

Keywords:Bored pile, Reverse Circulation Construction Method, Scale model test, Drilling efficiency