Title:
UNDERWATER DRILLING MACHINE
Document Type and Number:
Japanese Patent JP2002188386
Kind Code:
A
Abstract:
To improve workability and safety in drilling work for forming a developed space at a bottom part of a vertical hole drilled in the ground.
In this invention, a worm type elevation device is employed for eliminating problems due to elongation of a flexible suspension member or need for much time and labor in attachment and detachment of a link chain in conventional underwater drilling machine in accordance with progress of drilling work using the flexible suspension member such as a wire rope, the link chain, or the like from a truck crane or the like on the ground.
Inventors:
YOSHIDA TOSHIHIRO
Application Number:
JP2000390033A
Publication Date:
July 05, 2002
Filing Date:
December 22, 2000
Export Citation:
Assignee:
MITSUI MIIKE MACHINERY CO LTD
International Classes:
E21B7/12; E21B7/28; E21B7/30; (IPC1-7): E21B7/28; E21B7/12; E21B7/30
Attorney, Agent or Firm:
Katsuhiko Hashimoto (1 outside)