Front expanded anchor and pretension nail constructing method using thereof

摘要

According to the present invention, provided is an anchor with an expanded front end, comprising: an anchor body having a hollow cylindrical shape and an expanded front end to be hooked and supported on ground of an inner circumferential surface of a hollow wall so as to generate a resistance force; a fixing block located on a rear end side of the anchor body and fixed to an end of the hollow wall such that when the anchor body is inserted into an inner surface of the hollow wall, the anchor body is in a position parallel to a center of the hollow wall; a cone-shaped expansion block located on a front end side of the anchor body and expanding a front end of the anchor body to be hooked and supported on the ground of the inner circumferential surface of the hollow wall; and a nail inserted into the hollow wall in a state that the anchor body, the fixing block, and the expansion block are integrally coupled to one another, and securing pretension by a pressure plate and a nut configured on a front end located on the ground after the expansion block moves toward the front end of the anchor body during a rotation in a predetermined direction in the state to expand the anchor body toward the ground and to perform grouting on the hollow wall.