Title:
DRILLING METHOD OF VERTICAL HOLE AND GUIDE DEVICE THEREOF
Document Type and Number:
Japanese Patent JPH07197459
Kind Code:
A
Abstract:
PURPOSE: To prevent a vertical hole from tilting and prevent excavating tools from breaking when a pile is inserted in a vertical hole perpendicularly excavated in the ground by the excavating tools and the next vertical hole adjacent to the vertical hole is excavated.
CONSTITUTION: A horizontal support shaft 8 is installed on a base 1 detachably fitted on a pile 4. A roller 9 is supported on the support shaft 8 to be freely rotatable. A vertical hole is cut by an excavating tool while the external periphery of easing 16 of the excavating tool is forced to contact the roller 9 without rotary movement.
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Inventors:
MURAZAKI KAZUO
Application Number:
JP35185393A
Publication Date:
August 01, 1995
Filing Date:
December 29, 1993
Export Citation:
Assignee:
JIYUUWA KOKI KK
International Classes:
E02D7/00; (IPC1-7): E02D7/00
Attorney, Agent or Firm:
Shoichi Wakata