Multi-purpose bolt unit for fixing object to drilled hole of soft construction structure

A multi-purpose bolt unit for fixing an object to a drilled hole formed in a soft construction structure, the multi-purpose bolt unit comprising:

• a cylindrical body inserted into the drilled hole of the soft construction structure;
• a front end tip formed at a lower end of the cylindrical body and having a larger outer diameter than an outer diameter of the cylindrical body;
• an upper thread surface formed in an upper side of the cylindrical body while spaced apart from the front end tip;
• an elastic packing pipe inserted into the cylindrical body and placed on the front end tip;
• an upper washer inserted into the cylindrical body and placed on an upper end of the elastic packing pipe;
• a compression nut screwed to the upper thread surface and pressurizing the upper washer so that the elastic packing pipe expands;
• and
• a fastening screw groove formed inside the cylindrical body and opened upward through the compression nut,
• wherein the compression nut comprises:
• a nut cap screwed to the upper thread surface to be spaced apart from an upper end of the cylindrical body;
• a cap through-hole formed in an upper side of the nut cap to expose the fastening screw groove;
• and
• a wrench groove formed in an upper side of the nut cap, exposing the cap through-hole, and having a wrench inserted therein not to be rotatable,
• wherein an inner diameter of the cap through-hole is larger than an inner diameter of the fastening screw groove and smaller than an inner diameter of the wrench groove.