Rebar rock bolts for coal mines

Rebar bolts for coal mines

In China, mine-used rebar bolts are also called non-longitudinal rebar rebars, which are divided into two types: left-handed and right-handed. The nut is special and does not need to be threaded at the end. The specifications are 16mm, 18mm, 20mm, 22mm, 25mm. The length can be processed from 1600mm to 2500mm. The advantage is that no wire is used.

Reinforced steel resin anchor rod without longitudinal ribs implements the MT146,2-2002 standard. It is a kind of bolt made by special processing technology. The strength of the threaded section is greater than the strength of the rod body. The threaded section has good flexural and shear resistance. It is a new type of bolt with high-strength support for combined roadways. The anchor rod has high strength, reasonable structure and large pre-tightening force, can automatically adjust the force direction, increase the restraining force on the surrounding rock, and can realize mechanized and rapid installation. End anchors, extended anchors and full anchors are mainly used for high-strength support of large deformation roadways in high ground pressure mines, and can also be used for high-strength and long-lasting roadway support of various projects such as railways and hydropower.

1. Determine the anchor rod hole position according to the design requirements, and drill the hole with a drilling machine;

2. Blow out the rock dust in the hole with pressurized air;

3. Feed the anchoring agent into the bottom of the hole, use an anchor rod to hold it up and start mixing (the mixing time is according to the type of anchoring agent). After the mixing is completed, remove the mixing equipment. After the waiting time is reached, remove the mixing connector and install the anchor Disc, ball washer, friction washer, and use a special wrench to tighten the nut. Structure: rod body, anchor plate, spherical washer, friction washer, nut, damping plug

It consists of a threaded steel type metal rod and a nut. The rear end of the threaded steel type metal rod is provided with a thread. The nut is screwed on the threaded rod at the rear end of the threaded steel type metal rod. The front and end of the nut are cap nuts. In the hemispherical shape, the inner cavity of the screw hole at the rear of the nut is equipped with a lock washer. The inner hole diameter of the lock washer is smaller than the outer diameter of the threaded steel metal rod. It is a kind of anchor metal rod with good anti-loose, anti-vibration performance and reliable support.