Title:
COLUMN BUILDING-UP DEVICE AND COLUMN BUILDING-UP METHOD
Document Type and Number:
Japanese Patent JP2008174981
Kind Code:
A
Abstract:
To provide a column building-up device and a column building-up method, easy in construction, by preventing rotation of a column to the ground surface.
This column building-up device 1 has two excavation rods 26 and 27 in parallel, and is characterized in that an excavation bit 29 for excavating by rotating in the ground, is arranged on the tip of the respective excavation rods 26 and 27, and a diameter of the excavation bit 29 can be expanded and contracted, and a circular hole formed by respective excavation bits 29 is mutually partially overlapped, and the two excavation bits 29 are arranged in positions mutually dislocated in the axial direction of the excavation rods 26 and 27.
Inventors:
TANAKA MASAYOSHI
Application Number:
JP2007009943A
Publication Date:
July 31, 2008
Filing Date:
January 19, 2007
Export Citation:
Assignee:
TANAKA MASAYOSHI
International Classes:
E21B10/32; E01F9/60; E01F9/623; E01F9/658; E01F9/685; E01F9/696; E21B3/02
Attorney, Agent or Firm:
Osamu Matsushima