Title:
UNDERGROUND CRUSHING METHOD AND APPARATUS
Document Type and Number:
Japanese Patent JPS60250192
Kind Code:
A
Abstract:
Method and apparatus for crushing the earth under the ground by boring a hole; inserting a drill head having radially directed water jet thereon down the hole to the desired stratum; rotatingly moving the drill head upwardly while jetting water radially to form a cylindrical crushed area; lowering the drill head to the original depth; extending a water jet extender arm radially to a projecting position; again rotatingly moving the drill head upwardly while jetting water from the nozzles on the radial outward portions of the extender arm to radially enlarge the cylindrical crushed area, the rotation of the extender arm also stirring the already crushed area; returning the extender arm to an original waiting position; and lifting the drill head out of the hole.
Inventors:
IKEDA TAROU
YAHIRO TERUO
YOSHIDA HIROSHI
NISHI KENJI
ISOBE TAKAHISA
HAMANO EISHIN
KUME YOUICHI
YAHIRO TERUO
YOSHIDA HIROSHI
NISHI KENJI
ISOBE TAKAHISA
HAMANO EISHIN
KUME YOUICHI
Application Number:
JP10465584A
Publication Date:
December 10, 1985
Filing Date:
May 25, 1984
Export Citation:
Assignee:
KAJIMA CORP
KANADA OIRU SANDO KK
KANADA OIRU SANDO KK
International Classes:
E21B7/18; E21B43/29; (IPC1-7): E21B7/18
Domestic Patent References:
| JPS3921522Y1 | ||||
| JPS5014688U | 1975-02-15 | |||
| JPS5650816A | 1981-05-08 | |||
| JPS5421331U | 1979-02-10 |
Attorney, Agent or Firm:
Toshitada Takahashi