Title:
試験用アタッチメント
Document Type and Number:
Japanese Patent JP6742633
Kind Code:
B2
Abstract:
To provide a test attachment applicable to a columnar ground improvement method.SOLUTION: This device comprises: a cylindrical body 20 including a first inside hole 20a along a longitudinal direction; and a head portion 30 exchanged with an auger rod 23 and mounted on a lower side joint 22. The head portion 30 includes: a second inside hole 32b continuing to the first inside hole 20a; and beak portions 33, 34 opening/closing a lower end portion of the second inside hole 32b. The beak portions 33, 34 are in a state of always closing the second inside hole 32b by pressure from a soil cement when in contact with the soil cement. The device comprises a protective tube 40 inserted into the first inside hole 20a and the second inside hole 32b when the head portion 30 reaches a target depth. The beak portions 33, 34 are pressed and expanded by a lower end portion 40a of the protective tube 40 that reaches the second inside hole 32b, to open the second inside hole 32b.SELECTED DRAWING: Figure 2
Inventors:
Hirofumi Usui
Yoshiyuki Okamoto
Shogo Tsutsumi
Takashi Yoshida
Yoshiyuki Okamoto
Shogo Tsutsumi
Takashi Yoshida
Application Number:
JP2017200328A
Publication Date:
August 19, 2020
Filing Date:
October 16, 2017
Export Citation:
Assignee:
Tenox Kyusyu Co., Ltd.
International Classes:
E02D1/02; E02D3/10; E02D3/12; E21B7/00; E21B11/00
Domestic Patent References:
| JP7279152A | ||||
| JP2004183434A | ||||
| JP2017160714A | ||||
| JP3191112A | ||||
| JP2014152473A | ||||
| JP10183591A |
Foreign References:
| US20170016279 |
Attorney, Agent or Firm:
Kazuyuki Hirano