1.Technical Specifications
| Item | T73/53 | T73/56 | T73/45 | T73/35 |
| Outer Diameter | 73 mm | 73 mm | 73 mm | 73 mm |
| Inner Diameter | 53 mm | 56 mm | 45 mm | 35 mm |
| Cross-Section Area | 1680 mm2 | 1369 mm2 | 2267 mm2 | 2700 mm2 |
| Ultimate Load | 1160 kN | 1035 kN | 1575 kN | 1865 kN |
| Yield Load | 970 kN | 830 kN | 1270 kN | 1430 kN |
| Weight | 13.2 kg/m | 10.75 kg/m | 17.8 kg/m | 21.2 kg/m |
| Thread Type | ISO 10208 | ISO 10208 | ISO 10208 | ISO 10208 |
| Steel Grade | EN 10083-1 | EN 10083-1 | EN 10083-1 | EN 10083-1 |
| Thread Direction | Left or Right | Left or Right | Left or Right | Left or Right |
| Standard Length | 1 m to 9 m | 1 m to 9 m | 1 m to 9 m | 1 m to 9 m |
2. Available Components
2.1 Anchor Bar
The T73 anchor bar is the main load-bearing component. Its continuous hollow core allows grout to be pumped through the bar, while the external thread profile improves bonding with grout and enables secure connection with accessories.
2.2 Nut
| Item | Specification |
| Wrench Size | 95 mm |
| Length | 70 mm |
| Hardness | HRC 25-30 |
| Thread Type | ISO 10208 |
| Steel Grade | CK45 |
| Unit Weight | 2.2 kg |
| Thread Direction | Left or Right |
2.3 Coupler
| Item | Specification |
| Outer Diameter | 95 mm |
| Length | 235 mm |
| Hardness | HRC 23-30 |
| Thread Type | ISO 10208 |
| Steel Grade | EN 10083-1 |
| Unit Weight | 4.3 kg |
| Thread Direction | Left or Right |
2.4 Bearing Plate
| Item | Specification |
| Size | 250 x 250 mm |
| Thickness | 40 mm |
| Hole Diameter | 80 mm |
| Unit Weight | 18 kg |
Centralizer
| Item | Specification |
| Outer Diameter | 130 mm |
| Length | 80 mm |
| Hole Diameter | 87 mm |
| Material | CK45 |
| Unit Weight | 1.2 kg |
Drill Bit Adapter
| Item | Specification |
| Anchor Thread | T73 |
| Drill Bit Thread | T103 |
| Length | 50 mm |
| Unit Weight | 1.3 kg |
3. Applications
The T103 Hollow grouting anchor system can be used for:
4. Installation Process
4.1 Preparation
Carry out site survey and ground analysis. Confirm length, quantity and layout of anchors required before installation.
4.2 Drill
Drill borehole at anchor location. Depth, direction and diameter of borehole should comply with project requirements.
4.3 Insert anchor bar
Place T73 hollow grouting anchor bar into hole and position it as required.
4.4 Grouting
Inject grout through hollow center of anchor until borehole is filled and surrounding voids are filled with grout.
4.5 Install accessories
Install remaining accessories including bearing plate, nut, etc. Tighten and adjust as needed.
4.6 Curing
Allow grout to cure and inspect installation before continuing works.
5. Surface Protection Options
Available coatings and surface protection options include:
• Hot dip galvanizing per ISO 14 061 standards.
• Epoxy resin coating.
• Bending test performance: ISO 15 19
• Impact test performance: ASTM D27 94.
• Adhesion test perforamnce: ISO 24 09:2007.
6. FAQ
Q: What is a T73 hollow grouting anchor bar?
A: A T73 hollow grouting anchor bar is a solid threaded steel anchor that has a hollow center. It is designed for underground support and allows installation of grout through the anchor itself.
Q: Where can I use the T73 anchor system?
A: T73 anchors are used for tunnel support, metro projects, mining, underground construction, roadways, slope support and reinforcement, foundation support and reinforcement, and structural reinforcement of bridges, tunnels and underground constructions.
Q: What is the difference between T73/53, T73/56, T73/45 & T73/35?
A: These refer to different sizes of T73 hollow grouting anchor bars. Each has different inner diameter, cross-section surface area, load capacities and weighs different amounts. Smaller inner diameter equates to higher cross-section area load capacity.
Q: Can I pressure grout the T73 anchor bars?
A: Yes. Since the anchor is hollow in the middle, you can pump grout through the anchor to help fill the borehole and provide better bonding strength.
Q: What accessories are available for the T73 anchor system?
A: Available accessories include anchor nuts, anchor couplers, anchor bearing plates, centralizers and drill bit adapters.
Need an effective and reliable hollow grouting anchor system for tunnel, mining or underground projects?
Get in touch with our team to learn more about T73 anchor bar sizes, support and get a free quotation today.
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