Title:
METHOD OF DRILLING CONSTRUCTION OF CRUSHING BAND, ETC.
Document Type and Number:
Japanese Patent JPH01111984
Kind Code:
A
Abstract:
PURPOSE: To decrease frictional losses by rotating or longitudinally vibrating central hammers provided at the end of the center of a pipe which does not rotate, and crushing the natural ground through the longitudinal movements of round hammers provided therearound. CONSTITUTION: Central hammers 2, 2... which are rotated and vibrated by a longitudinal vibrating device 3 and a rotating device 4 are provided at the end of a pipe 1. A plurality of round hammers 5, 5... which are vibrated longitudinally by the longitudinal vibrating device 6 are arranged on the outer periphery of the hammer 2 or the like and an air ejecting hole 7 is provided in the center. The pipe 1 is inserted into the natural ground, and as the hammer 2 or the like is rotated and vibrated, the hammer 5 or the like is longitudinally vibrated to crush the natural ground while compressed air is ejected from the hole 7 and air around the hammer 2 is sucked to convey soil. Thus, since the pipe 1 is not rotated, frictional losses can be eliminated.
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Inventors:
KUBOTA TSUTOMU
Application Number:
JP26771387A
Publication Date:
April 28, 1989
Filing Date:
October 23, 1987
Export Citation:
Assignee:
KUBOTA TSUTOMU
International Classes:
E21B7/04; E21B6/00; E21B6/02; (IPC1-7): E21B6/00; E21B7/04
Attorney, Agent or Firm:
Horikoshi Yasushi
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