T76 Self-Drilling Anchor Bar for Micropiles and High Load Support
T76 self-drilling anchor bar for high-load micropiles, tunnel forepoling, foundation underpinning and major ground support.
| Designation | T76N / T76S hollow self-drilling anchor bar |
| Outer Diameter | 76 mm |
| Typical Inner Diameter | 45-49 mm depending on variant |
| Typical Yield Load | About 1200-1500 kN |
| Typical Ultimate Load | About 1600-1900 kN |
| Typical Weight | About 16.5-19.0 kg/m |
| Installation | Heavy self-drilling installation with matching T-thread accessories |
| Main Use | Micropiles, high-load ground support, forepoling, underpinning |
T76 hollow self-drilling anchor bar for high-capacity micropiles, heavy tunnel pre-support, foundation underpinning and demanding ground reinforcement.
Product Overview
T76 is a heavy hollow bar series used where high load capacity and large grout volume are required. It is commonly considered for micropile-style support, heavy tunnel forepoling and major ground improvement applications.
The large hollow core allows cement grout to be delivered through the bar during or after drilling. Once cured, the steel bar and grout column transfer load into the surrounding ground.
Because T76 systems require appropriate drilling equipment and project design, buyers should confirm rig capacity, borehole diameter, grout plan and accessories before ordering.
Product Image Gallery
Real anchor product images from the current SunSea Steel media library, showing hollow bars, threaded profiles, grouting anchor rods and accessory details.
Technical Specifications
| Designation | T76N / T76S hollow self-drilling anchor bar |
|---|---|
| Outer Diameter | 76 mm |
| Typical Inner Diameter | 45-49 mm depending on variant |
| Typical Yield Load | About 1200-1500 kN |
| Typical Ultimate Load | About 1600-1900 kN |
| Typical Weight | About 16.5-19.0 kg/m |
| Installation | Heavy self-drilling installation with matching T-thread accessories |
| Main Use | Micropiles, high-load ground support, forepoling, underpinning |
Applications and Ground Conditions
Micropiles
High-capacity hollow bar reinforcement for foundation support and underpinning.
Tunnel forepoling
Used for heavy pre-support where design requires high stiffness and load capacity.
Weak ground improvement
Large grout body helps consolidate challenging ground conditions.
Infrastructure support
Suitable for demanding retaining, tunnel and foundation works.
Performance Advantages
High capacity
T76 provides the strongest capacity range among these listed anchor products.
Large grout flow
The large hollow core supports cement grout delivery for bigger grout columns.
System assembly
T76 bars can be installed in sections with matching couplers.
Heavy-duty support
Appropriate for engineered works that require verified load performance.
Selection Guide
Choose T76 only when project design, drilling equipment and ground conditions justify a high-capacity hollow bar system.
| T76N | High-load option with balanced bore size and steel section. |
|---|---|
| T76S | Stronger wall section for higher tensile capacity. |
| Equipment | Confirm rig torque, drilling method and grout pump capacity. |
| Accessories | Use matched T76 bits, couplers, nuts, plates and centralizers. |
Quality Control and Installation Checks
Material and load verification
Confirm bar designation, wall thickness, yield load, ultimate load and weight per meter before production. Mill test certificates can be supplied for export orders.
Thread and coupler fit
Thread profile, coupler engagement, nut fit and plate compatibility should be checked as a complete system rather than separate parts.
Grouting control
Record grout mix, pressure, volume, return flow and curing time. Proper grout filling is essential for bond strength and corrosion protection.
Site acceptance
Installed length, drilling depth, bit diameter and accessory quantity should be recorded for each anchor position.
Accessories, Packaging and Export Supply
Matched accessory kits
Bars can be supplied with sacrificial drill bits, couplers, nuts, plates and centralizers according to project bill of materials.
Export packaging
Bundles are prepared for long-distance sea freight, container loading and jobsite handling.
Custom lengths
Standard and project-specific lengths are available. Couplers support staged installation in confined working areas.
Documentation
Packing list, commercial invoice, mill test certificate and inspection records can be prepared according to order terms.
Why Choose SunSea Steel
- Real anchor product images from the current media library, not generic placeholders.
- Specification-driven quotation covering bar, bit, coupler, nut, plate and centralizer.
- Support for R25, R32, R38, R51, T76 and project-specific self-drilling anchor systems.
- Export-oriented packaging and documentation for international buyers.
- Technical communication focused on ground condition, load requirement and installation method.
- Responsive quotation support through email and WhatsApp template variables.
Frequently Asked Questions
What is T76 self-drilling anchor bar used for?
T76 is used for high-capacity micropiles, heavy tunnel forepoling, foundation underpinning and major ground support.
What load range is typical for T76 self-drilling anchor bar?
Typical T76 reference values are about 1200-1500 kN yield load and about 1600-1900 kN ultimate load depending on variant.
Can the hollow anchor bar be grouted through the center?
Yes. Cement grout is injected through the hollow core and exits near the sacrificial drill bit, filling the annular space around the bar.
Which accessories should be ordered with the anchor bar?
A complete order usually includes drill bits, couplers, nuts, bearing plates and centralizers matched to the bar thread and ground condition.
Can self-drilling anchors be used in collapsing boreholes?
Yes. The bar drills and remains in place, so installation does not depend on maintaining a stable open borehole before inserting reinforcement.
How do I choose between R32, R38, R51 and T76?
Selection depends on design load, required length, ground condition, borehole diameter, grout volume, equipment capacity and corrosion protection requirement.
Can the surface be galvanized or coated?
Hot-dip galvanizing, epoxy coating or project-specified corrosion protection can be discussed for permanent works.
What information is needed for quotation?
Send anchor size, length, quantity, design load, drill bit type, plate size, coupler quantity, ground condition and destination port.
Request Technical Support and Quotation
Send your anchor size, length, quantity, design load, ground condition, drill bit type, plate size, coating requirement and destination port. We will match the hollow anchor bar, drill bit, coupler, nut, plate and centralizer as a complete self-drilling anchor system.