Ground anchor construction method for anchoring area extended improvement using extended excavation agitator

摘要

The present invention provides an anchoring unit-expanded and improved ground anchor construction method using an expansion excavation stirring device, capable of improving a stirring effect of a cement grout material in an anchoring unit section and reducing construction time of expansion excavation and stirring. According to a proper aspect of the present invention, the anchoring unit-expanded and improved ground anchor construction method includes: (a) a step of boring an anchoring unit of an out-casing; (b) a step of injecting a first cement grout material; (c) a step of drawing out the out-casing; (d) a step of forming an expanded cement bulb; (e) a step of drawing out the expansion excavation stirring device and filling the cement grout material; (f) a step of inserting and placing an anchor assembly into the anchoring unit section expanded and stirred; (g) a step of removing the out-casing; and (h) a step of forming an inner anchor bulb having an anchor bulb by injecting a third cement grout material into a pack of the anchor assembly or a corrugated pipe.