In the present invention, in the earth anchor structure for ground reinforcement steel construction or support structure, inserted into the drilled hole are sufficient rigidity of solidarity and expansion anchors and anchor the body to assist in the settlement of the tension member to the ground by being extended to the inner circumference and more convenient to expand wealth expansion in the hole in the earth anchor structure, easy installation begins. ; The present invention to achieve this taper cone 12 in uiha liner 10 and anchor the cap 16 is installed on the front end of the anchor body 14 which is coupled, wherein the anchor cap (16) and Anchor body 10 that protrudes radially expanded by the elastic force of the spring 18 between the anchor 20 is installed, and so that the support member for supporting the expansion anchor (20) for the tension in the anchor cap liner, the extension The inner end of the anchor 20 is inserted in the anchor body 10 is inserted, it is turned off with the box holding the state to obtain the locking, which allows the radial projection (22) is installed. ; In one embodiment, the expansion anchor 20 is installed to anchor the cap 16 with the anchor rotated while projecting by a torsion spring in the axial bolt 24, the rotation shaft for coupling the main body 20, as another example Anchor extension 20 includes a distal end opening with a guide that provides a straight path soon as groove 26 is formed for projecting the expansion anchor 20 in the anchor body 14, this expansion anchor 20 in the insertion the expansion anchor (20) is spring loaded and is projected to be elastic expansion anchor (20), the elastic springs and interlocking protrusion 28 is formed.
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