The present design relates to a strong anchor to be used in in order to safely secure heavy objects on the construction site concrete structures.; Object of the present invention is by being dropped insert a strong anchor to the proper drilling in concrete structures it as secure the weights to the concrete structure and shifting other appointed conical expansion gaebu and close contact with hammer sustained in close contact with the concrete structure to secure the strong anchor .; The hammer anchor nut upon compression additional wear and can be distorted, but can be smoothly entered into the anchor bolt by the anchor nut protection unit.; Also, drilling in concrete structures are cone-shaped side expansion gaebu and close tube-expanding to be a rather significant drilling operation than in the strong anchor diameter, is in close contact with the perforation diameter of the concrete beneath to give close contact with the concrete structure by the fixed support of the lower end of the anchor cap the cone is the same as the expansion and adhesion gaebu convenience diameter shock and vibration are also stably fixed to, is added to the conical widening lost during handling and transportation of the strong anchor to prevent separation by the reality that strong anchor is disposed of in a widening buhom.; The subject innovation can improve the work efficiency by the fixing of the strong anchor to be used in in order to secure the weights to the concrete structure as the take-off to address the various problems of the above to occur safely and easily and material costs and labor and labor savings and and a strong anchor that can reduce safety risks to provide.
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