R25N Ground Engineering Tool Self Drilling Anchor Hex Nut
The Self Drilling Anchor (SDA) system is a bolting solution for difficult ground and rock
conditions. The system enables drilling and grouting in one
operation, making much saving in jobsite and project time. Which is
comprised of a hollow threaded anchor bar with a sacrificial drill
bit that performs drilling, anchoring and grouting in a single
operation. Self drilling anchor system is mainly used in slope
stabilization, tunneling pre-support, foundations with micro piles
etc jobs, which is widely used in mining, tunneling, railway, metro
construction etc projects.
Characteristic:
1. Applying for both the domed plate and flat plate.
2. All nuts exceed the ultimate strength of the self-drilling
anchor bar.
3. It can meet the stringent demands on anchor specification.
4. Hot-dip galvanizing for corrosion protection.
Anchor Nut
| Model | R25N |
| Key Size (mm) | 41 |
| Length (mm) | 41 |
| Hardness (HRC) | 20-30 |
| Thread Type | R25 |
| Raw Material | C45/40Cr |
| Unit Weight (kg) | 0.25 |
| Thread | R25 |
1. Connect the alloy drill and anchor rod one end, on the other
end, connect the drill sleeve and shank adapter ,then connect the
drilling rig or hand-held drill. Then start drilling, fill the
cooling water while drilling.( If you want to lengthen the anchor
rod, can connect the coupling, and then drilling)
2. Take down the drill, put the stop-grouting plug into the rod,
and insert it to the hole, then ready to grout. Special
circumstances like surrounding rock grouting tension is over or
surrounding rock is too broken, can use anchor agent to seal the
hole.
3. Connect quick grouting coupling and anchor rod end, connect
other end of grouting machine.
4. Start grouting, when grouting full and reach design value then
power off . Grouting pressure according to the design parameters
and grouting machine performance determine ,Cement/sand reference
values is 1:0 ~ 1:1, water/cement reference value is 0.45:1 ~
0.5:1.
5. Install anchor plate and nuts, and tighten nuts.
