Method of forming anchor bolt hole in concrete structure and its forming mechanism

摘要

The present invention particularly relates to a structure capable of easily removing the hole for mounting anchor bolt on the bridge pier of a bridge without outside the hole forming the hole of the anchor bolt after pouring concrete after the curing by coring A method in which an anchor bolt hole can be simply formed by injecting concrete in a state in which a cylindrical sleeve having a helical spline coupled thereto is inserted to pull out the sleeve after hardening the pier, The mechanism of the present invention is characterized in that the inner surfaces 14, 24, 34 and 44 are formed at one end of each of the outer surfaces 12, 22, 32 and 42 of constant curvature inward 26, 36, 46 protruding in different lengths from each other are welded between the outer side surfaces and the inner side surfaces to form a cylindrical shape when mutually engaged. A plurality of split-type sleeve 10, 20, 30, 40 having the same shape; A lower cap 50 formed with a step 52 in which an outer bottom of the split type sleeve is positioned on an upper surface of the upper surface and an engagement hole 56 in which a lower end of the drawing rod 54 is coupled to the upper surface of the lower cap 50; And a hole 62 in which the lead rod 54 is inserted is formed at the center. A plurality of outer holes 64 are formed on the outer side so as to fit the spiral rods of the split type sleeve, And an upper cap (60) having a groove (66) for receiving the upper end of the outer surface of the sleeve.