Anchor rod classification--Rebar bolt(Threaded steel bolt)

Rebar bolt(Threaded steel bolt)

The anchor rod is made of threaded steel bars. The processing technology is as follows: first cut the outer surface of one end of the bar (length 80-100) on a lathe (or squeeze it with special equipment) into a circle with a diameter that meets the requirements. On this length, it is processed into a thread that meets the national standard.

According to the difference between the transverse and longitudinal bars of the rebar, the rebar can be divided into architectural rebar, left-handed and right-longitudinal rebar and right-handed no-longitudinal rebar bolt.

Most of the architectural rebar bolts are double-stranded and two-reinforced rebar. Although the rebar can be combined with the anchoring agent, when the anchor is installed, the radius of the longitudinal reinforcement of the rod is larger than the rotation radius of the rebar, resulting in the thread of the rod. It can't be tightly combined with resin colloid and can't produce strong binding force. At the same time, the two-way thread is not conducive to the packing and compactness of the anchoring agent, thus reducing the anchoring strength.

In view of the shortcomings of the two-way rebar, the bolt body is specially rolled into one-way non-longitudinal rebar, and the longitudinal rebar is eliminated. The one-way thread is a left-handed thread, which is the same as the direction of rotation when the anchor is injected. When the anchor rod is rotated and injected, and the resin medicine roll is stirred by the anchor rod, under the rotation of the one-way left-hand thread, a strong pressure is generated to advance to the deep part. Under the action of this pressure, the resin anchoring agent in liquid state can fill the cracks in the hole and drain the sewage in the hole, thereby increasing the binding force between the anchoring agent and the bolt body, and the bonding between the anchoring agent and the rock mass. It can effectively improve the anchoring force of the anchor rod. The one-way left-handed Threaded Steel Bolt without longitudinal reinforcement can be used in all kinds of mines and underground projects, and is especially suitable for coal roadway bolting and mesh support, and has achieved good technical and economic effects.