The ZTRFM Split Set Friction Bolt Roll Forming Machine is designed for manufacturing high-strength Split Set Rock Bolts, also known as Friction Stabilizers or Friction Rock Bolts, used in underground mining, tunnel reinforcement, and slope stabilization projects.
As global mining operations continue to expand into deeper and more challenging ground conditions, reliable support systems have become increasingly important. Therefore, mining contractors and ground support manufacturers require durable friction bolts that can deliver immediate holding power and long-term stability.
To meet these demands, ZTRFM provides a fully automated production line capable of producing different sizes of split set bolts with excellent forming accuracy, stable welding quality, and high production efficiency.
What Is a Split Set Friction Bolt?
A Split Set Friction Bolt is a slotted steel tube used for rock reinforcement and ground stabilization. The bolt is inserted into a drilled hole slightly smaller than its diameter. As a result, the tube compresses and creates continuous radial pressure against the rock surface.
This frictional force immediately stabilizes the surrounding ground and helps prevent rock movement. Moreover, when the rock shifts over time, the friction bolt adapts to the changing conditions and maintains strong support performance.
A standard split set system mainly includes:
- Slotted friction bolt tube
- Domed bearing plate
- Welded ring
- Pull collar
- Installation driver
Because of its simple structure and fast installation speed, the system is widely used in modern mining and tunneling projects.
Main Features of the ZTRFM Split Set Bolt Production Line
The ZTRFM roll forming machine integrates punching, roll forming, welding, and cutting into one automated production process. Consequently, manufacturers can improve productivity while reducing labor costs and material waste.
The production line typically includes:
The ZTRFM Split Set Friction Bolt Roll Forming Machine is equipped with a complete automatic production system, including a hydraulic decoiler for stable coil loading, a servo feeding device for accurate material feeding, and a precision roll forming system that ensures consistent bolt shaping and dimensional accuracy. In addition, the production line features a PLC-controlled automatic welding unit to provide reliable weld quality and stable performance during continuous operation. After forming and welding, the profile is processed through a hydraulic cutting system for precise length cutting, while the finished products are automatically transferred to the product receiving table for convenient collection and packaging.
In addition, the machine adopts heavy-duty forming rollers and precision welding technology to ensure stable bolt dimensions and reliable ring welding strength.
Compared with traditional manufacturing methods, the automated system improves consistency and guarantees better product quality for mining support applications.
Common Split Set Bolt Specifications
The machine can produce various bolt sizes according to different underground support requirements.
| Model | Diameter | Thickness | Length Range | Surface Finish | Application |
|---|---|---|---|---|---|
| FB-33 | 33 mm | 2.0–2.5 mm | 0.6–1.8 m | Black / HDG | Temporary Ground Support |
| FB-39 | 39 mm | 2.5 mm | 0.9–3.0 m | Black / HDG | Tunnel & Mining Support |
| FB-42 | 42 mm | 2.5 mm | 0.9–3.0 m | Black / HDG | Slope Stabilization |
| FB-47 | 47 mm | 3.0–3.2 mm | 0.9–3.0 m | Black / HDG | Heavy-Duty Ground Support |
Furthermore, ZTRFM also supports customized specifications based on customer requirements, including different slot widths, bolt lengths, and galvanized coatings.
Applications in Mining, Tunnels, and Slope Reinforcement
Split set friction bolts are widely used in both underground and surface support projects. In practical applications, they help stabilize rock formations, reinforce tunnel walls, and improve overall operational safety.
Typical applications include:
- Underground hard rock mining
- Coal mine roof support
- Hydropower tunnels
- Railway and highway tunnels
- Rock slope stabilization
- Ground reinforcement projects
In many mining operations, split set bolts are used together with welded mesh and bearing plates to form a complete support system. Additionally, operators can grout the bolts when higher anchoring capacity is required.
Because of their excellent performance and simple installation process, split set friction bolts continue to be one of the most trusted support systems in the mining industry.
Advantages of Split Set Friction Bolts
Split set bolts remain one of the most efficient ground support solutions in mining engineering. Since they provide immediate frictional anchorage, they significantly improve installation speed and underground safety.
Immediate Ground Support
The bolt creates instant radial pressure once installed into the drill hole.
Fast Installation
Operators can install the bolt quickly using handheld drills or mechanized jumbo equipment.
Flexible Ground Adaptation
Unlike rigid support systems, friction bolts adjust to ground movement and maintain holding strength over time.
Cost-Effective Solution
The simple two-component design reduces manufacturing and installation costs.
Corrosion Protection Options
Galvanized split set bolts offer improved performance in humid and corrosive underground environments.
With years of manufacturing experience and continuous technology upgrades, ZTRFM helps customers produce high-quality split set bolts efficiently and competitively for global mining markets.
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