Anchor bolt

The utility model relates to an anchor bolt, it includes the screw rod, expandable casing is female with the awl, the one end of screw rod is equipped with the external screw thread, expandable casing's middle part is equipped with a circular through -hole, expandable casing's one end is the portion of autotomying, evenly be equipped with four rectangle through groove in should the portion of autotomying, the lateral wall of the portion of should autotomying evenly is equipped with a plurality of topers arch, the female middle part of awl is equipped with a circular through -hole, the internal thread has been laid in this circular through -hole, this internal thread closes with the outer thread to match of screw rod, the screw rod cup joints with expandable casing, be equipped with a gasket between screw rod and expandable casing, the awl is female to pass through threaded connection with the screw rod, cooperate with expandable casing's the portion of autotomying in awl mother's pyramis. The utility model di