Patent ID: 11959294
Assignee: 4A SYSTEMS CO., LTD.
Field: Civil engineering (Other fields)
Classification: CPC E  F | IPC E

Claim 0:
1. 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.