JB Rock Bolts & SN BOLTS are used in various Hydro Power Projects, Road Projects and Projects of the similar nature to provide strength and durabilty FUSSION BONDED EPOXY COATED & GALVANIZED MATERIALS AVAILABLE as well.
Rock bolts are 15 to 32 diameter bars, inserted in 30 to 60 mm bore holes. They are generally between 3 and 6 meters long.
They may be bonded along their entire length by cement grouting or anchored at various points at the base of the hole using chemical resin or a mechanical anchorage. Rock bolts transfer load from the unstable exterior, to the confined (and much stronger) interior of the rock mass.
Applying the principles of systematic rock anchoring to soil seems to be obvious, but the requirements for soil nailing are higher. Soil nails are 20 to 50 mm diameter bars, inserted in 70 to 150 mm bore holes. They are generally over 6 meters long and may be as much as 30 meters.
These two techniques above insert the reinforcing element (reinforced concrete) into the soil/rock mass. Both solid and hollow bars are available. Solid bars are usually installed into the pre-drilled holes and then grouted into place using a separate grout line, whereas hollow bars may be drilled and grouted simultaneously by the use of a sacrificial drill bit and by pumping grout down the hollow bar as drilling progresses. Applying for underground applications in unconsolidated soil/rock conditions, hollow bar is typically effective.