Types Of Anchor Bolts

Anchor bolts are of the following types:
(i) Expansion anchor bolts
Expansion anchor bolts, referred to as expansion bolts, use the relative movement of the cone and the expansion sheet (or expansion sleeve) to cause the expansion sheet to expand, generate expansion and extrusion force with the concrete on the hole wall, and generate pull-out force through shear friction to achieve anchoring of the connected parts. Expansion anchor bolts are divided into torque control type and displacement control type according to the different expansion force control methods during installation. The former is controlled by torque, and the latter is controlled by displacement.
(ii) Hole expansion anchor bolts
Hole expansion anchor bolts, referred to as hole expansion bolts or groove cutting bolts, are a component that realizes anchoring of the connected parts by re-grooving and expanding the concrete at the bottom of the drill hole, and using the mechanical interlocking between the concrete pressure-bearing surface formed after the hole expansion and the expansion expansion head of the anchor bolt. Hole expansion anchor bolts are divided into pre-expansion and self-expansion according to the different hole expansion methods. The former uses special drilling tools to pre-expansion and expand the hole; the latter anchor bolts come with tools, and self-expansion and expansion are performed during installation, and the grooving and installation are completed in one go.
(III) Bonding anchor bolts
Bonding anchor bolts, also known as chemical bonding bolts, or chemical bolts or bonding bolts for short, are components that use special chemical adhesives (anchoring glue) to bond and fix screws and internal threaded pipes to the drilled holes of concrete substrates. Through the bonding and locking action between the adhesive and the screw and between the adhesive and the concrete hole wall, the connected parts are anchored.
(IV) Chemical rebar planting
Chemical rebar planting includes threaded steel bars and long screws, which is a post-anchor connection technology widely used in my country's engineering industry. The principle of chemical rebar planting is the same as that of bonding anchor bolts, but chemical rebar planting and long screws are not limited in length, which is similar to the anchoring of cast-in-place concrete steel bars. The failure mode is easy to control and can generally be controlled as the failure of anchor steel. Therefore, it is suitable for the anchoring connection of structural members or non-structural members with static and seismic fortification intensity ≤8.