HIGH AND LOW PRESSURE INJECTION TYPE GROUND IMPROVING DEVICE AND GROUND IMPROVING METHOD USING SAME

The present invention relates to a high and low pressure injection type ground improving device and a ground improving method using the same that is capable of injecting an injection liquid at a high pressure into an upper portion of an agitating blade and at the same time injecting an injection liquid at a low pressure into a lower portion of the agitating blade, thereby gently achieving punching and agitation. According to the present invention, the high and low pressure injection type ground improving device includes: an agitator rod (6a) having a center passage (10) formed from top to a position corresponding to an installation position of an agitator blade (6b) in such a manner as to communicate with an interior of a rod (5), a lower passage (20) formed under the center passage (10) in such a manner as to be connected to the center passage (10), and a high pressure passage (30) having one side communicating with the center passage (10) and the other side penetrated into the outer peripheral ...