T-Thread Self Drilling Hollow Bar
Tthread self drilling hollow bar.
T thread is designed and produced according to T International Standard, and the rod anchor types are: T30, T40, T52, T73, T76, T103. T thread makes itself good bond to the accessories or rotary drill rigs. Its high strength makes it widely used in deep foundation, slope stabilization, tunnel, mine or other geological disaster areas.
If the rib height increases or the number of ribs per unit length increases, the relative rib area increases. The rib area fR is used as a parameter for the bonding quality of T thread anchor bolts, and the optimal value is fR = 0.21 – fR = 0.33.
T – Threaded Hollow Bars
Thread Profile: All thread, commonly referred to as fully threaded, continuously threaded. The T Thread is according to international standard. It is an alternative to Titan IBO drilling bars for CTS system.
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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T – THREAD IBO BARS
TECHNICAL DATA
| T30 | T40L | T40N | T52 | T76L | T76N | T76S | |
|---|---|---|---|---|---|---|---|
| Average Inner Diameter | 11.0 mm | 20.0 mm | 16.0 mm | 26.0 mm | 58.0 mm | 51.0 mm | 44.0 mm |
| Cross-Sectional Area | 420 mm² | 715 mm² | 879 mm² | 1250 mm² | 1610 mm² | 1990 mm² | 2400 mm² |
| Yield Load | 260 kN | 430 kN | 525 kN | 730 kN | 1000 kN | 1200 kN | 1500 kN |
| Ultimate Tensile Load | 320 kN | 540 kN | 660 kN | 930 kN | 1200 kN | 1600 kN | 1900 kN |
| Yield Stress | 620 Mpa | 600 Mpa | 590 Mpa | 580 Mpa | 620 Mpa | 600 Mpa | 620 Mpa |
| Ultimate Stress | 760 Mpa | 750 Mpa | 750 Mpa | 750 Mpa | 750 Mpa | 800 Mpa | 790 Mpa |
| Weight | 3.30 kg/m | 5.60 kg/m | 6.90 kg/m | 9.90 kg/m | 12.60 kg/m | 15.60 kg/m | 18.80 kg/m |
| Elongation Agt | > 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.
