The present invention is connected to the reader to enable the lifting of a crane as a stirrer for digging soil improvement for digging and agitating the soil, the main body frame is provided to enable the reader to lift and; And at least one drive motor mounted to the body frame; Provided on the body frame housing for lifting along the leader and; With a pair of spacing is accommodated in the housing and arranged in two rows, four gear portion is formed inside the anti-bonding agent or air to first pass the ball to be selectively supplied to and; Provided between the pair of gear portions to mutually adjacent, and actuator fisherman for transmitting power of the driving motor to the gear unit of the pair; Mutually adjacent rest is disposed opposite to the fisherman the drive between a pair of gear unit, the idle gear portion which rotates in engagement with the gear portions of the pair with another one; Is provided between the drive fishermen and the idle gear portion, the anti-caking agent or air inside the ball is formed a second passage that is selectively supplied to, and the auxiliary gear portion for transmitting the rotating force of the drive fisherman to the idle gear portion; Four drilling rod coupled to each of the four gear portion digging and stirring the ground and; It characterized in that it comprises an auxiliary drilling rod coupled to the secondary gear portion digging and agitating the soil.
As a result, by digging a stirrer for ground improvement according to the invention by providing an auxiliary drilling rod in the center of four drilling rod it is arranged in pairs in two rows constituting the excavating load of 5 axis, drilling with a ground soil and anti-caking agent It can be stirred evenly blend rock.
In addition, it is possible to promote the anti-bonding agent and agitating action ground soil by injecting air into the anti-caking agent and the ground soil is being stirred through the auxiliary drilling rod.