Hollow Grouting Anchor Rod System for Tunnel and Slope Support
Hollow grouting anchor rod system for self-drilling installation, cement grout injection and reliable ground support in tunnels, slopes and excavations.
| System Type | Hollow grouting anchor rod with self-drilling installation |
| Grout Path | Cement grout injected through hollow bar core |
| Common Sizes | R25, R32, R38, R51, T76 |
| Main Function | Ground reinforcement, load transfer, grout bonding and corrosion protection |
| Grout Records | Mix, pressure, volume, return flow and curing time |
| Installation | Drill, flush, grout and anchor with one hollow bar system |
| Accessories | Drill bit, coupler, nut, bearing plate, centralizer |
| Applications | Tunnel support, slope stabilization, rock bolting, soil nailing, excavation support |
Hollow grouting anchor rod system for cement grout injection, load transfer and reliable ground support in tunnels, slopes, excavation faces and fractured rock.
Product Overview
The hollow grouting anchor rod system combines a threaded hollow steel bar with grout injection. During installation, grout passes through the center of the bar and fills the annulus around the anchor, creating a bonded reinforcement column.
This product is suitable for tunnel support, slope stabilization, rock bolting and soil nailing where grout quality directly affects load transfer and long-term durability.
Correct grout mix, pressure, volume, return flow and curing records are essential for reliable performance. The system should be ordered with matching drill bits and accessories.
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
| System Type | Hollow grouting anchor rod with self-drilling installation |
|---|---|
| Grout Path | Cement grout injected through hollow bar core |
| Common Sizes | R25, R32, R38, R51, T76 |
| Main Function | Ground reinforcement, load transfer, grout bonding and corrosion protection |
| Grout Records | Mix, pressure, volume, return flow and curing time |
| Installation | Drill, flush, grout and anchor with one hollow bar system |
| Accessories | Drill bit, coupler, nut, bearing plate, centralizer |
| Applications | Tunnel support, slope stabilization, rock bolting, soil nailing, excavation support |
Applications and Ground Conditions
Tunnel grouting
Supports tunnel face, crown, portals and fractured excavation zones.
Slope soil nailing
Creates bonded reinforcement in loose soil and weathered rock.
Rock bolting
Transfers steel bar capacity into the surrounding rock through grout bond.
Excavation support
Useful for retaining faces, temporary works and urban deep excavations.
Performance Advantages
Controlled grout path
The hollow core delivers grout directly to the drill bit and borehole annulus.
Bond improvement
Threaded bar profile improves interlock with hardened cement grout.
Quality records
Grout pressure, volume and return flow can be recorded for each anchor.
Corrosion support
Full grout cover helps protect steel when properly installed.
Selection Guide
Choose the grouting anchor rod system when grout bond, ground consolidation and installation records are central to the support design.
| Tunnel works | R32-R51 for face bolting and crown support; T76 for heavier support where specified. |
|---|---|
| Slope works | R32 or R38 for common soil nailing; R51 for heavier slopes. |
| Micropile works | R51 or T76 where design permits hollow bar micropiles. |
| Quality control | Confirm grout mix, pressure, volume, return flow and curing requirements. |
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 a hollow grouting anchor rod system used for?
It is used for tunnel support, slope stabilization, soil nailing, rock bolting and excavation support where grout bond is important.
What load range is typical for a hollow grouting anchor rod system?
Load capacity depends on bar series, steel section, grout bond, ground condition and installation quality.
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.