GROUND IMPROVING METHOD IN WHICH HARDENED COLUMNAR BODY CAN BE ANCHORED TO HARD SUPPORTING GROUND, AND GROUND IMPROVING APPARATUS USED FOR THE METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method for economically and definitely anchoring a round columnar hardened body to the ground and the apparatus used for the method in hard bearing ground where the improvement is proposed such as rock layer, top of the underground structure or the bottom base of a pneumatic caisson.;SOLUTION: A stirring vane 3 of a stirring head 2 attached to the lower portion of a grouting rod 1 connected to a freely liftable rotation drive apparatus 9 supported by a strut 8 is formed to an improved apparatus 10 extended diagonally downward for the grouting rod 1, the grouting rod 1 is penetrated to the improved proposed ground 11 and, without overexcavation, the grouting rod 1 is rotated and pulled up and a hardened columnar body 7 is formed on the hard supporting ground 12 while jetting a hardening material 6 onto the hard supporting ground 12 from a tip nozzle 4 of the stirring vane 3 provided by sloping downward.;COPYRIGHT: (C)2001,JPO