Hollow Grouted Self Drilling Tunnel Rock Bolt Mining Anchor Bolt
Introduction Of Hollow Drilling Mining Rock Grouting Anchor Bolt
1, Hollow Drilling Mining Rock Grouting Anchor Bolt consists of hollow core with continuous hot-rolled outside thread
2, Hollow Drilling Mining Rock Grouting Anchor Bolt can application as injection anchor without casing, especially for non-stable boreholes
3, self-drilling installation, utilization of the anchor bar as drill rod with a single-use drill bit
4, easy extension of the anchor bars by anchor coupler
5, grouting or development of the grout body either simultaneously with drilling using a rotary injection adapter or afterwards
6, assembly of the anchor head with the anchor plate and the nut, stressing and locking
Specification
Anchor Bar
| Bar | R32L | R32N/21 | R32N/18.5 | R32S | R32SS |
| Outside Diameter (mm) | 32 |
| Internal Diameter (mm) | 22 | 21 | 18.5 | 17 | 15 |
| Cross Sectional Area (mm2) | 356 | 363 | 433 | 440 | 522 |
| Ultimate Load (kN) | 260 | 280 | 280 | 360 | 405 |
| Yield Load (kN) | 200 | 230 | 230 | 280 | 300 |
| Weight (kg/m) | 2.8 | 2.85 | 3.4 | 3.45 | 4.1 |
| Thread Type | ISO10208 |
| Type of Steel | EN10083-1 |
| Thread (Left / Right hand) | Left or Right |
| Length (m) | (1) x 2, x3, x4, x5, x6, x7, x8, x9 |
| Optional of Anti-corrosion | Hot-dipped Galvanization: ISO 1461 Epoxy Coating Bending properties up to standard ISO 1519 Impact properties up to standard ASTMD 2794 Adhesion up to standared ISO 2409:2007 |
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.
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