1.Technical Parameters
| Item | Specification |
| Product Name | Water Expansion Rock Bolt |
| Bolt Diameter | 28 mm / 38 mm |
| Profile Diameter | 27.5 mm / 36 mm |
| Material Thickness | 2 mm / 3 mm |
| Upper Sleeve Diameter | 28 mm / 38 mm |
| Expansion Tube Diameter | 30/37 mm, 41/48 mm |
| Borehole Diameter | 32-39 mm, 43-52 mm |
| Minimum Breaking Load | 120 kN / 160 kN / 240 kN / 230 kN |
| Minimum Elongation | 10% / 20% |
| Typical Elongation | 15% / 30% |
| Standard Length | 1.5-4.0 m / 2.4-6.0 m |
| Customization | Available |
Note:
Shell of water expansion bolt can be provided in various sizes and different load bearing specifications. Custom sizes are available upon request.
2. Applications
Water expansion rock bolts can be used for underground support and rock reinforcement projects such as:
Underground mines
Tunnels
Rock roadways
Slopes and caverns
Temporary / Permanent ground support
Fast excavation support
Any project that requires chemical free rock anchoring
3. How Does it Work?
A water expansion rock bolt is first placed into a drilled hole and then expanded with water pressure. When the bolt expands, the bolt body presses against the wall of the borehole. This forms friction between the rock surface and the bolt body which creates an anchoring effect.
The bolt does not require curing time and can provide immediate ground support, allowing for faster tunneling and excavation work.
4. Benefits of Using
4.1 No Chemical Materials Needed: For expansion you only need water. Resin, cement and other chemical materials are not needed.
4.2 Immediate Ground Support: Expandable rock bolts provide immediate support after expansion. Making them ideal for faster tunneling and mining applications.
4.3 Safe and Environmentally Friendly: Since there is no mixing of chemical materials on site, this provides a clean application.
4.4 Stable Frictional Anchoring: After expansion, the tube rests tightly against the borehole wall, creating frictional contact with the rock surface.
4.5 Available in Different Sizes: Water expansion rock bolts are available in different diameters, lengths and load capacities.
5. Installation Instructions
5.1 Choose appropriate bolt diameter, bore hole diameter and length based on rock and support conditions.
5.2 Ensure that bore hole is drilled to specification before installation.
5.3 Expand bolt with correct water pressure equipment following the recommended expansion procedure.
5.4 Inspection and pull-out tests can be conducted after installation if required by project.
6. FAQ
6.1 What is the use of water expansion rock bolt?
Water expansion rock bolt is commonly used for underground mine support, tunnel support, rock roadway reinforcement among other ground support projects.
6.2 Is resin or cement required?
No. Water expansion rock bolt only requires water pressure to expand.
6.3 Can it be used for immediate support?
Yes. Water expansion rock bolts provide immediate support after expansion.
6.4 What drill bit size is required?
Common bore hole diameters are 32-39mm and 43-52mm. This depends on the specification of the bolt.
6.5 Are custom sizes available?
Yes. We have multiple shell sizes and load bearing capacities available. Custom specifications can be discussed upon request.
6.6 I need a quote, what information do you need?
Bolt diameter, length, required load strength, quantity, application and general use, bore hole diameter and the project port destination.
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We deliver complete support for underground reinforcement applications, covering: Mining roof and sidewall support systems Tunnel reinforcement solutions Slope stabilization engineering support Foundation anchoring systems Underground safety structural systems From early-stage project planning to on-site application, we help customers build safer and more stable underground environments.
Wanfeng provides a fully integrated product supply system, enabling customers to source all ground support materials from one supplier: Rock bolt systems (resin / FRP / threaded) Cable bolts & anchoring systems Steel arches & I-steel support systems Wire mesh & reinforcement mesh Plates, nuts, bolts & fastening components Resin & cement anchoring materials Mining tools & consumable accessories Our one-stop supply capability reduces procurement complexity and improves project efficiency.
We ensure stable and reliable product performance through strict manufacturing and quality control systems: Standardized production processes Raw material inspection and control Mechanical performance testing Load-bearing and tensile strength verification Batch consistency inspection Final quality inspection before shipment Every product is engineered to meet demanding underground safety requirements.
We also support customized solutions for different mining and engineering projects: Customized rock bolt specifications Non-standard steel support design Special mesh and reinforcement structures Project-based product configuration OEM / private label cooperation We work closely with global partners to develop tailored solutions for complex underground environments.
With strong export experience, we provide efficient global delivery and supply chain support: International export packaging standards Container loading optimization Multi-region shipping support Fast production scheduling for urgent projects Stable long-term supply agreements We ensure reliable delivery to mining projects across different countries and regions.
We support customers throughout the entire project lifecycle: Technical documentation support Installation guidance assistance Product replacement support Long-term supply continuity Engineering consultation for project expansion Our goal is to build long-term partnerships, not just single transactions.
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