山岳トンネル(7)

[VI-901] Development of anhydrous drilling boring technology using screw rods for a wide range of geological properties

〇Akira Toda¹, Minoru Yamagishi¹, Takashi Toushiba² (1.HAZAMA ANDO CORPORATION, 2.JAPAN FOUNDATION ENGINEERING CORPORATION)

Keywords:heaving of the bottom, anhydrous drilling, screw rods , Ultra-small drilling machine