Principle of reaming anchor bolt:

The principle of expanding hole type anchor bolt is to expand the bottom of the existing concrete hole form a self-locking mechanism when the expansion plate of the head of the anchor bolt expands. It is generally understood that the head of anchor bolt has space to expand in the concrete hole, there will be no expansion extrusion stress, there will be no slippage under the external allowable load.

Because the expansion plate of anchor bolt the concrete taper surface produce extrusion friction force to form the locking key to achieve the fixed function, so there should be strict requirements for the quality of concrete reaming, the accuracy of reaming directly affects the anchoring strength.

According to the structure, the rear belled anchor bolt is divided into:

Each expansion plate of anchor bolt has milling cutter tooth, which can contact with the chip. Because the expansion plate of anchor bolt in this structure expands gradually under external pressure is always in close contact with the concrete hole wall during the cutting process, the hole expanding precision is high. After the anchor bolt is applied with external load, the contact extrusion stress between the expansion plate the conical concrete hole wall is uniform. The design of multiple cutter teeth on the head of anchor bolt can realize continuous cutting, only can it cut concrete, but also can complete reaming when there is steel bar to form a locking key mechanism. LZK self cutting reaming anchor bolt successfully solves the problem that the hole cannot be enlarged when there is reinforcement, which is a major technical breakthrough in the field of mechanical post anchoring