Rebar anchoring method
A rebar anchoring system and method are provided. The system includes: a rebar, with an external thread formed on the periphery of at least one end; an anchoring head, with a first perforation and a second perforation disposed respectively at both ends extending axially into the anchoring head and communicating with each other, the inner sides of the first and second perforations being formed respectively with a first internal thread matching with the external thread of the rebar and a second internal thread, and the anchoring head being mounted on the end of the rebar through the first internal thread and the external thread of the rebar; and a bolt, having a screw rod matching with the second internal thread, the screw rod being locked into the second perforation of the anchoring head, and the end of the screw rod pressing against the end of the rebar.
1. A rebar anchoring method, comprising the steps of:
providing a rebar, and forming an external thread on the periphery of at least one end of the rebar;
combining the rebar with other rebars to form a rebar structure, and having the rebar with external thread extending into the rebar structure;
providing an anchoring head, the anchoring head having a first perforation disposed at an axial end extending axially into the inside of the anchoring head and a second perforation communicating with the first perforation being disposed at the other axial end extending axially into the inside of the anchoring head, the inner side of the first perforation being formed with a first internal thread matching with the external thread of the rebar, the inner side of the second perforation being formed with a second internal thread, and one end of the anchoring head being mounted on the end of the rebar through the first internal thread matching with the external thread of the rebar;
providing a bolt, the bolt having a screw rod matching with the second internal thread of the anchoring head, locking the screw rod into the second perforation from the other end of the anchoring head, when the end of the screw rod is pressed against the end of the rebar, applying a torque to the bolt so that the screw rod continues to exert a longitudinal pressure on the end of the rebar, so that the anchoring head exerts a longitudinal tension on the rebar for the anchoring head and the rebar to mutually affix; and
grouting by pouring mixed concrete water into the rebar structure so that the anchoring head anchors securely when the concrete dries and hardens;
wherein an annular groove surrounding the circumference of the screw rod is formed at a position on the outer surface of the screw rod around a central axis, and the diameter of the bottom surface of the annular groove is smaller than the outer diameter of the screw rod; when the torque applied to the bolt exceeds a predetermined value, the screw rod is broken along the annular groove.
2. The rebar anchoring method according to claim 1 , wherein the anchoring head has a radial net cross-sectional area larger than four times of the radial cross-sectional area of the rebar.
3. The rebar anchoring method according to claim 1 , wherein a segment of the rebar with external thread is formed in the shape of a round rod or a tapered rod, and the first perforation of the anchoring head is formed to have a shape of a round hole or a tapered hole to match the shape of the round rod or tapered rod respectively.
4. The rebar anchoring method according to claim 1 , wherein the first perforation and the second perforation formed at both ends of the anchoring head are linearly aligned in the axial direction.