GROUND ANCHOR CONSTRUCTION METHOD FOR ANCHORING AREA EXTENDED IMPROVEMENT USING EXTENDED EXCAVATION AGITATOR

摘要

The present invention provides a ground anchor construction method for the extended improvement of an anchoring area using an agitator for extended excavation, which has high pullout resistance. According to an embodiment of the present invention, the ground anchor construction method for the extended improvement of an anchoring area using an agitator for extended excavation comprises: a step (a) of inserting an outer casing into the earth ground and inject water pressure into the outer casing to perform a boring work; a step (b) of inserting an agitator for extended excavation into the outer casing and forming a bulb in an anchoring area by injecting a cement grouting liquid in the front end of the agitator for extended excavation; a step (c) of locating the agitator for extended excavation on the inner side of the front end of the outer casing; a step (d) of reinjecting the cement grouting liquid in the front end of the agitator for extended excavation to form an inner cement bulb; a step (e) of drawing out the agitator for extended excavation out of the outer casing; a step (f) of locating an inner structure of an anchor assembly in the cement bulb in the anchoring area; and a step (g) of drawing and removing the outer casing from the earth ground before the grouting liquid in the step (d) is hardened.