Title:
掘削装置および杭孔の拡径方法
Document Type and Number:
Japanese Patent JP6638363
Kind Code:
B2
Inventors:
Makoto Arakawa
Yabe Fumio
Yabe Fumio
Application Number:
JP2015242427A
Publication Date:
January 29, 2020
Filing Date:
December 11, 2015
Export Citation:
Assignee:
Obayashi Corporation
International Classes:
E21B11/00; E02D5/34; E02D5/44; E02D5/48; E02D7/00; E21B3/02
Domestic Patent References:
| JP11336457A | ||||
| JP7145616A | ||||
| JP2008013971A |
Foreign References:
| US6685398 |
Attorney, Agent or Firm:
Isshiki International Patent Service Corporation