Hot-Dip Galvanized Self-Drilling Anchor Bar for Permanent Ground Support
Hot-dip galvanized self-drilling anchor bar for permanent ground support where corrosion protection is specified, used with full grout cover and matched accessories.
| Product Type | Hot-dip galvanized hollow self-drilling anchor bar |
| Common Sizes | R25, R32, R38, R51, T76 according to design |
| Finish | Hot-dip galvanized when project-specified |
| Corrosion Strategy | Zinc coating plus cement grout cover and project inspection |
| Thread Type | Continuous R-thread or T-thread hollow bar |
| Accessories | Galvanized or project-specified drill bit, coupler, nut, plate, centralizer |
| Applications | Permanent slopes, retaining works, tunnel portals, infrastructure support |
| Design Note | Service life and corrosion allowance must follow project specification |
Hot-dip galvanized hollow self-drilling anchor bar for permanent slopes, retaining structures, tunnel portals and ground support projects requiring corrosion protection.
Product Overview
Permanent ground support requires more attention to corrosion than temporary construction support. Hot-dip galvanized self-drilling anchor bars can be specified when the project needs additional zinc coating protection together with grout cover.
The system still works as a hollow self-drilling anchor: the bar drills the hole, grout is injected through the core, and the threaded bar remains as the reinforcement tendon.
Galvanizing does not replace project design. The engineer must define service life, exposure class, grout cover, coating thickness, inspection and any additional protection required.
Technical Specifications
| Product Type | Hot-dip galvanized hollow self-drilling anchor bar |
|---|---|
| Common Sizes | R25, R32, R38, R51, T76 according to design |
| Finish | Hot-dip galvanized when project-specified |
| Corrosion Strategy | Zinc coating plus cement grout cover and project inspection |
| Thread Type | Continuous R-thread or T-thread hollow bar |
| Accessories | Galvanized or project-specified drill bit, coupler, nut, plate, centralizer |
| Applications | Permanent slopes, retaining works, tunnel portals, infrastructure support |
| Design Note | Service life and corrosion allowance must follow project specification |
Product Image Gallery
Real images from the current Self Drilling Anchor media group, used to show bar body, thread profile, hollow grouting rod and accessory details.
Applications and Real Ground Conditions
Permanent slopes
Used where soil nails or anchors remain as part of long-term stabilization.
Retaining structures
Suitable for permanent excavation walls and reinforced shotcrete facings.
Tunnel portals
Useful in exposed portal slopes and approach cuttings.
Infrastructure support
Applied in road, railway, hydropower and civil foundation support works.
Performance Advantages
Added corrosion protection
Zinc coating provides an additional barrier when specified for permanent works.
Full system compatibility
Bars and accessories can be matched for thread and coating requirements.
Grout cover support
The hollow bar grouting process helps form protective grout cover around the steel.
Long-term documentation
Material records and inspection documents support project quality files.
Selection Guide
Choose galvanized self-drilling anchors when permanent support, exposure condition or owner specification requires corrosion protection beyond plain steel.
| Temporary works | Plain steel may be adequate when service life is short and design allows it. |
|---|---|
| Permanent works | Specify galvanizing, grout cover and inspection requirements. |
| Aggressive ground | Ask the designer whether double corrosion protection or special coating is needed. |
| Accessories | Confirm whether nuts, plates, couplers and centralizers also require galvanizing. |
Quality Control and Installation Checks
Material verification
Confirm nominal diameter, internal diameter, wall thickness, weight, yield load and ultimate load against the order specification and mill certificate.
Thread and coupler fit
Check thread profile, coupler engagement, nut fit and bearing plate compatibility before dispatch.
Grouting records
On site, record grout mix, pressure, volume, return flow and curing time because bond quality controls final anchor performance.
Installation traceability
Track installed length, drilling depth, bit diameter, coupler quantity and anchor location for each support point.
Export Packing and Matched Accessories
Matched system supply
Bars can ship with sacrificial drill bits, couplers, nuts, bearing plates and centralizers according to the bill of materials.
Export bundles
Bundles are prepared for container loading, sea freight and jobsite handling.
Length options
Standard and project-specific lengths can be supplied; couplers support staged installation in restricted work areas.
Documents
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 placeholder stock images.
- Specification-based quotation covering bar, drill bit, coupler, nut, plate and centralizer.
- Support for R25, R32, R38, R51, T76 and project-specific hollow bar systems.
- Export-oriented packing and documentation for international ground engineering buyers.
- Professional communication around design load, ground condition, grout plan and installation method.
- Contact-ready CTA with email and WhatsApp template variables.
Frequently Asked Questions
What is hot-dip galvanized self-drilling anchor bar used for?
It is used for permanent ground support, permanent slopes, retaining structures, tunnel portals and infrastructure works where corrosion protection is specified.
How does a self-drilling anchor work?
The hollow threaded bar acts as the drill string during installation. Cement grout is pumped through the hollow core and the same bar remains in the ground as the reinforcement tendon.
Why use a hollow bar instead of a conventional solid bar anchor?
A hollow bar system reduces the need for a stable open borehole before tendon insertion, which is useful in loose soil, fractured rock, fill and water-bearing ground.
What load information should be checked?
Load capacity depends on the selected bar size, not the galvanizing itself. Confirm yield and ultimate load for the exact R25, R32, R38, R51 or T76 bar.
How should the correct anchor size be selected?
Choose galvanized anchors when service life, exposure or owner specification requires zinc coating plus grout cover and inspection records.
Which accessories are normally required?
A complete system normally includes sacrificial drill bit, coupler, nut, bearing plate and centralizer matched to the bar thread.
Can the product be used for permanent works?
Permanent works require project-specified corrosion protection, full grout cover and inspection records. Hot-dip galvanizing or other coatings can be discussed when required.
What information is needed for quotation?
Send bar size, length, quantity, design load, ground condition, drill bit type, plate size, corrosion protection requirement and destination port.
Request Technical Support and Quotation
Send anchor size, length, quantity, design load, ground condition, drill bit type, plate size, corrosion requirement and destination port. We will match the bar, bit, coupler, nut, plate and centralizer as a complete self-drilling anchor system.