Customer Support Pain Points & Core Needs
Solving support challenges in mining and high-stress tunnels.
Traditional rigid bolts fail during rock mass convergence in high-stress zones.
Lengthy grouting processes stall mining production and increase labor costs.
Harsh underground water conditions compromise the integrity of standard steel supports.
Difficulty maintaining reliable grip in fractured or soft rock formations.
Complex installation workflows require specialized skills and heavy equipment.
Core Needs
Support that adapts to rock movement without fracturing.
Transferring load across the entire length of the borehole.
Instant mechanical interlock for immediate personnel protection.
Split Set Bolt & Swellex Bolt Overview
Full-length friction bolts for complex geological conditions.
Split Set Bolt
A high-strength steel tube with a longitudinal slot, forced into a slightly smaller borehole.
Relies on radial spring force to create friction against the borehole wall over its entire length.
C-shaped tube, tapered end for insertion, and heavy-duty bearing plate ring.
Swellex Bolt
A folded steel tube that is expanded inside the borehole using high-pressure water.
Hydraulic expansion creates a permanent mechanical interlock with the rock's irregularities.
Welded tubular construction, specialized inflation bush, and integrated dome plate.
Split Set Bolt – Slotted Body, Plate & Ring
Full-length frictional support to actively control rock mass deformation.
Slotted Tube
Cold-rolled high-strength steel with axial slot for elastic recovery force.
Bearing Plate
Distributes load and prevents surface spalling (150x150mm+).
Welded Ring
Securely holds the plate and transfers reaction forces.
High initial anchorage (30kN/m+)
Constant resistance
Adaptability to fractured rock
Swellex Bolt – Folded Tube, High-Pressure Bush, Plate & Ring
Plastic expansion for full-length tight anchorage and high-load support.
Folded Tube
High-strength seamless steel, folded to 27mm for easy insertion into 38mm holes.
Inflation Bush
One-way valve at the end for high-pressure water pump connection.
Plate & Ring
Thickened high-strength steel plate for heavy-duty support.
Extreme load capacity (100kN+)
Zero-gap contact
High impact resistance, Permanent support
Split Set & Swellex Technical Comparison
Clear view of dimensions, load capacity, and borehole compatibility.
| Outer Diameter | 30 ~ 45mm |
| Wall Thickness | 2.0 ~ 3.5mm |
| Std Length | 1400 ~ 2400mm |
| Initial Anchorage | >= 30kN/m |
| Plate Load | 70 ~ 80kN |
| Tube Diameter | 27 ~ 36mm |
| Std Length | 1.5 ~ 6.2m |
| Ultimate Load | 100 ~ 240kN |
| Borehole | 32 ~ 39mm |
| Impact Resistance | HIGH |
Friction Anchoring Principle & Full-length Energy Absorption
Leveraging elastic and plastic mechanical mechanisms to provide continuous radial support and superior energy dissipation in volatile strata.
Friction Anchoring Principle
Engineered for immediate stability. Split Set bolts generate radial pressure against the borehole wall through elastic compression, while Swellex systems utilize high-pressure hydraulic expansion to conform perfectly to irregular rock surfaces.
Elastic/Plastic Mechanism
Adaptive structural response. The Split Set utilizes high-strength steel's elastic deformation for constant clamping, whereas Swellex bolts undergo permanent plastic expansion, locking the bolt into the rock mass with unparalleled mechanical interlocking.
Full-length Contact
Eliminate stress concentrations. Unlike point-anchor bolts, frictional systems provide uniform load distribution across the entire length of the borehole, significantly reducing the risk of localized rock failure and enhancing overall tunnel integrity.
Energy Absorption
Dynamic load management. These bolts are optimized for rock burst environments; the sliding resistance of Split Sets provides constant support during displacement, while Swellex offers high-impact absorption for sudden energy releases.
Standard Installation Steps & Precautions
Fast, efficient workflows designed to ensure immediate, full-length structural support with minimal downtime.
Precision Drilling
Execute borehole to specified diameter (e.g., 35-38mm for standard Split Sets) ensuring verticality.
Borehole Cleaning
Clear debris using compressed air or water to ensure maximum surface contact for friction.
Bolt Insertion
Insert the rock bolt using an impact hammer (Split Set) or manual positioning (Swellex).
Hydraulic Expansion
For Swellex systems, activate the high-pressure pump to expand the bolt until the relief valve triggers.
Final Verification
Inspect dome plate tightness and visually confirm the installation meets safety documentation standards.
Construction Precautions
- 01 Hole Diameter Match: Verify drill bit size within ±1mm of bolt specifications to maintain frictional grip.
- 02 Straightness: Ensure borehole straightness to prevent bolt buckling during high-energy insertion.
- 03 Plate Tightness: The bearing plate must be flush against the rock face for optimal load transfer.
- 04 Equipment Maintenance: Regular calibration of hydraulic pumps and impact hammers is mandatory.
- 05 Personnel Safety: Always operate under supported ground; use remote installation arms where possible.
- 06 Environmental Conditions: Monitor geological shifts or water ingress during installation to adjust bolt tension if necessary.
Engineering Applications of Frictional Rock Bolts
Discover how our high-performance stabilization solutions secure diverse geological environments across the globe.
Mine Roadway Support
Providing essential reinforcement for underground mine stability, ensuring safe passage and structural integrity in active production zones.
Slope & Tunnel Engineering
Stabilizing excavations for safe transportation infrastructure, preventing rockfalls and securing high-traffic civil engineering projects.
Rock Burst Areas
Specialized energy absorption systems designed for high-stress seismic zones where dynamic loads require flexible yet unyielding support.
Fractured Rock & Fault Zones
Effective anchorage in complex geological formations where traditional support systems fail due to shifting fault lines and loose strata.
Permanent Support
Long-term structural integrity for industrial projects, providing maintenance-free stability for critical facility foundations and retaining walls.
Hydropower Station Support
Securing massive concrete and rock interfaces in power plants, ensuring the structural safety of essential national energy infrastructure.
Technical Innovations & Performance Upgrades
Advancing load capacity, corrosion resistance, and installation efficiency through precision engineering.
Self-Expanding Split Set
Built-in expansion cartridge increases radial pressure while maintaining yield characteristics. Engineered for maximum ground control with load capacity up to 90kN.
Small Diameter Stabilizers
Achieve higher radial contact stress and superior anchorage per meter. Designed for cost-effective implementation and significantly faster drilling cycles in hard rock.
High-Load Swellex
Massive 100-240kN capacity tailored for deep high-stress mines. Features a full-length mechanical interlock that adapts to volumetric changes in the rock mass.
Enhanced Corrosion Protection
Swellex provides tight hole contact to exclude groundwater effectively. Specialized galvanized and epoxy coatings available for Split Sets in aggressive environments.
Why Leading Mines Choose Our Frictional Rock Bolts
Safety, stability, and customized solutions for the most challenging subterranean ground conditions.
Safety
Full-length friction or expansion support reduces fall-of-ground risks immediately.
Stability
High energy absorption adapts to rock burst and extreme high-stress zones.
Reliability
Proven performance leads to high customer retention and long-term security.
Customization
Tailored lengths, diameters, and coatings for specific site lithology.
End-to-End
Integrated manufacturing and global logistics support for global operations.
Split Set Bolt Models & Specifications
High-anchorage, reliable, full-length frictional support for diverse mining applications.
- Outside Diameter 30 mm
- Wall Thickness 2.0 - 3.0 mm
- Initial Anchorage ≥ 30 kN/m
- Plate Load ≥ 70 kN
- Outside Diameter 35 mm
- Wall Thickness 2.0 - 3.0 mm
- Initial Anchorage ≥ 30 kN/m
- Plate Load ≥ 80 kN
- Outside Diameter 45 mm
- Wall Thickness 2.5 - 3.5 mm
- Initial Anchorage ≥ 30 kN/m
- Plate Load ≥ 80 kN
Swellex Bolt Series - Advanced Hydraulic Solutions
High-load capacity, extreme impact resistance, and adaptability to deep-level mining conditions.
- Diameter 27mm
- Ultimate Load 120kN
- Length 1.5-6.2m
- Diameter 32mm
- Ultimate Load 160kN
- Length 1.8-6.2m
- Diameter 34mm
- Ultimate Load 200kN
- Length 1.8-6.2m
Global Project Case Studies & Field Applications
Proven performance of our frictional rock bolts in the world's most challenging mining and tunneling projects.
Overseas Gold Mine Roadway Support
Split set bolts used for fractured rock zones, ensuring rapid advancement and worker safety in high-production environments.
Deep-Level High-Stress Mining
High-capacity Swellex bolts absorbing rock burst energy in extreme stress environments at depths exceeding 1,200 meters.
Slope & Tunnel Stabilization
Bolts combined with shotcrete for early-stage deformation control in hydropower projects and large-scale civil slope stabilization.
Maximize Your Mine’s Safety & Efficiency
Full range of Split Set & Swellex solutions. High load-bearing, rapid installation, and custom engineering. Request your technical consultation today.
- Fast Installation & Immediate Support
- High Load Capacity in Extreme Environments
- Customized Engineering & Global Logistics