Rope Thread Self Drilling Hollow Bar
Rope thread self drilling anchor bar
Rope/ R thread was firstly invented by MAI in 1960s to solve the low construction speed on complicated underground works. R thread is designed and produced according to ISO 10208 (R25, R32, R38) and ISO 1720 (R51). The thread is usually left hand.
R thread anchor bar can be connected and installed quickly in the loosing or collapsing stratums, which could be drilling and grouting in one step.
Rope Threaded Hollow Bars
Thread Profile: All rope thread, commonly referred to as fully rope threaded, continuously threaded. The Rope Thread is according to ISO 10208
Steel Material: C45E/S460NH
Surface Treatment: Galvanized or Epoxy coating when necessary.
Others: Chamfered, stamped or color coded for grade identification when necessary.
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ROPE THREAD IBO BARS
TECHNICAL DATA
| R25 | R32L | R32N | R32S | R32SS | R38 | R51L | R51N | |
|---|---|---|---|---|---|---|---|---|
| Average Inner Diameter | 12.0 mm | 21.5 mm | 20.5 mm | 17.0 mm | 15.0 mm | 22.0 mm | 39.0 mm | 34.0 mm |
| Cross-Sectional Area | 300 mm² | 304 mm² | 365 mm² | 440 mm² | 520 mm² | 610 mm² | 700 mm² | 990 mm² |
| Yield Load | 150 kN | 160 kN | 230 kN | 280 kN | 330 kN | 400 kN | 450 kN | 630 kN |
| Ultimate Tensile Load | 200 kN | 210 kN | 280 kN | 360 kN | 400 kN | 500 kN | 550 kN | 800 kN |
| Yield Stress | 500 Mpa | 526 Mpa | 630 Mpa | 640 Mpa | 630 Mpa | 650 Mpa | 640 Mpa | 640 Mpa |
| Ultimate Stress | 670 Mpa | 690 Mpa | 770 Mpa | 820 Mpa | 770 Mpa | 820 Mpa | 790 Mpa | 800 Mpa |
| Weight | 2.30 kg/m | 2.60 kg/m | 2.90 kg/m | 3.40 kg/m | 4.10 kg/m | 4.75 kg/m | 5.60 kg/m | 7.70 kg/m |
| Elongation Agt | > 5% | > 5% | > 5% | > 5% | > 5% | > 5% | > 5% | > 5% |
ONTON’s wholly-owned R&D center has strong R&D capabilities and the ability to transform technology into productivity.
Self drilling anchor bar can achieve drilling and grouting in one step to greatly reduce installation time.
- Drilling. Use a trolley or drilling rig to drill the anchor rod connected to the drill bit to the designed depth.
- Grouting. Remove the drilling rig, install the grout stopper, 25cm away from the hole. Connect the exposed end of the anchor rod to the grouting machine through a quick grouting joint. Start the machine to grout.
- Stop the grouting machine when the grouting is full and the pressure reaches the design value. The grouting pressure is determined based on the design parameters and grouting machine performance. Water-cement ratio reference value: (0.35~0.45):1.
- Install backing plate and nut to lock the anchor rod according to design.
Features of self drilling threaded anchors:
- With R thread (ISO 10208 & ISO 1720) and T thread (T international standard), the anchor bar could be left hand or right hand thread. R thread and most T thread hollow bars usually left hand, and T73 anchor bar is right hand thread. But the thread direction could be customized according to customers’ requirements.
- Special heat treatment technology to improve anchor bar’s strength without changing the internal diameter and unit weight of the anchor rod.
- Roll forming technology to form full-length threads on the anchor rods surface. With various components, to realize the integration of drilling, grouting, anchoring and other functions.
The anchor rods no need to be pulled out, and the hollow space could be used as a grouting channel for grouting from the inside to the outside.
