Technical Advantages and Installation Procedure of rock bolts
The principal objective in the design of a roof support system is to help the rock mass create a self-supporting structure. The usage of rock
bolts can be combined with wire mesh, shotcrete and concrete lining to cope with different situations encountered during mining or tunneling.
Tecon.
Technical Advantages
Self Drilling- Installation of the bolt is quicker and simpler when it drills it’s own hole.
Strength- axial load capability (stiffness) is increased through the combined use of a mechanical anchor plus full encapsulation with either
thixotropic or cementatious grout.
Pretension- as the bolt is pre-tensioned by use of the mechanical anchor, the rib layers are forced together before the injection of the
grout. Standard chemical capsules can be forced into cracks and fissures under the hydraulic pressure created when the bolt is inserted which
results in separations being held open and a loss in encapsulation.
Installation Procedure
Insert self drilling rib bolt in drill chuck.
Drill 36mm diameter hole in rib using SD Bolt & RH rotation on rig.
On completion of drilling, anchor bolt by using reverse rotation on drill motor to set expansion shell and tension bolt.
