The job arm and the joint possible terminal area of the small caliber propulsion machine and the non

摘要

PROBLEM TO BE SOLVED: To provide a small-diameter drilling machine and a non-open cut method which is used in a round hole construction method.;SOLUTION: This small-diameter drilling machine includes a connection part to be connected with a working arm of an excavator, a spherical face joint to be connected with the connection part, a suspension arm having a spherical body freely turnable in a spherical face receiving part in the spherical face joint at its upper end and downward extended, a fixing means provided in a bearing and fixing the spherical body at an optional bearing position, and a drilling device provided in a lower part of the suspension arm, drilling the ground in the straight direction, and stored in a round hole.;COPYRIGHT: (C)2011,JPO&INPIT