High-performance friction bolt systems engineered to withstand high tectonic stress, designed for rapid installation in active geological zones throughout Eastern Europe.
Serbia is experiencing an unprecedented industrial expansion, particularly in its rich mineral sectors like the Bor District (Zijin Mining Group projects including Čukaru Peki and Veliki Krivelj) and extensive transport infrastructure developments such as the Corridor 11 expressway tunnels. These projects push excavation depths deeper and expose support systems to complex geological conditions, including fault zones, heavy fracturing, and water inflows.
In these challenging subterranean environments, securing stable roof supports quickly is critical to preventing rock falls and ensuring miner safety. Friction stabilizers, commonly known as Split Sets, play a dominant role. By expanding along the borehole length, they exert a continuous radial force against the rock. The effectiveness of this system depends greatly on the installation quality. As a primary manufacturer supplying the Serbian market, we deliver robust Split Set Stabilizer Installers (dolly pushers, installation rigs, and driver tools) that ensure correct insertion speed, exact alignment, and optimal initial anchorage force.
Our solutions comply strictly with domestic Serbian regulations (such as safety laws regulated by the Ministry of Mining and Energy) as well as wider European safety guidelines, allowing operators to secure tunnels with zero downtime.
Unlike conventional resin-anchored bolts that rely on chemical curing, Split Set friction bolts offer immediate, active ground support through mechanical compression.
The C-shaped steel tube is manufactured to a larger diameter than the pre-drilled borehole. When hammered in by the installer, the tube contracts, storing spring energy that exerts a powerful radial friction pressure along the entire length of the hole.
Under heavy geological shifting, Split Sets yield slightly without failing, allowing the rock mass to settle naturally. This displacement tolerance is highly beneficial in seismically active Serbian mining belts.
Because there is no waiting time for chemical resins to cure, the ground support is immediately active upon completion of the installation stroke, saving precious cycle times for excavation crews.
To guarantee structural safety in large underground works, we supply Split Sets built with the highest quality structural carbon steel, treated with protective coatings to match the local moisture and acidity levels.
| Model Size | Outer Diameter (O.D.) | Recommended Borehole | Standard Thickness | Yield Strength Min. |
|---|---|---|---|---|
| SS-33 | 33 mm | 30.0 - 31.5 mm | 2.0 - 2.5 mm | ≥ 345 MPa |
| SS-39 | 39 mm | 35.0 - 37.0 mm | 2.3 - 3.0 mm | ≥ 355 MPa |
| SS-42 | 42 mm | 38.0 - 40.0 mm | 2.5 - 3.0 mm | ≥ 355 MPa |
| SS-46 | 46 mm | 42.0 - 44.0 mm | 3.0 mm | ≥ 355 MPa |
Given the highly mineralized and acidic drainage waters common in Eastern Serbian mine formations, plain steel rock bolts are highly susceptible to oxidation, which degrades the friction load over time. To combat this, we offer two main corrosion-barrier coatings:
Friction bolts depend entirely on tight interference fits. The following structured process guarantees optimal hold strength in underground installations.
The borehole diameter must match our recommended sizing charts. Drill too large, and the radial friction force drops significantly; drill too small, and the installer will damage the bolt flange before full insertion.
Mount the specialized installation driver (Dolly Pusher) onto your rock drill (such as a jackleg, stopper, or mechanized jumbo drill). Insert the driver shank securely into the open end of the Split Set stabilizer tube.
Using high impact frequency and steady feed pressure, drive the friction bolt into the hole. The installation should proceed smoothly until the dome plate is firmly pressed against the rock surface to secure the safety mesh.
Driving Innovation in Industrial Machinery and Building a New Era of Advanced Equipment Manufacturing
Shandong E-Way Machine Co., Ltd. is a modern industrial equipment manufacturer dedicated to the research, development, production, and service of high-quality machinery and engineering solutions. With a strong focus on technological innovation and manufacturing excellence, the company serves customers in mining, construction, and various heavy-duty industrial sectors worldwide.
Over the years, Shandong E-Way Machine has developed a diversified product portfolio covering mining and construction drilling equipment, pneumatic and hydraulic tools, anchoring and support systems, mechanical transmission components, and a wide range of spare parts and accessories. In addition, the company provides customized machining services, including precision components, structural parts, and wear-resistant engineering plastic products, meeting the specific needs of different working conditions and industries.
Innovation is the core driving force behind Shandong E-Way Machine’s sustainable development. The company brings together experienced engineers and technical experts specializing in mechanical design and industrial equipment development. Through continuous research and development, we improve product structures, enhance operational efficiency, and upgrade performance reliability. By integrating advanced manufacturing technologies and practical engineering experience, we have developed a series of independently designed products that deliver stable performance even under complex and demanding working environments.
Quality is the foundation of our enterprise. Shandong E-Way Machine strictly follows a comprehensive quality management system throughout every stage of production—from raw material selection and precision machining to final inspection and testing. Understanding the critical importance of safety in mining and industrial applications, our products are engineered with enhanced structural strength, safety protection features, and long-term durability. This ensures reliable operation under high load, harsh conditions, and continuous working environments.
At Shandong E-Way Machine, we uphold a customer-first philosophy and are committed to delivering complete lifecycle support. Our service system includes pre-sales consultation, technical solution design, installation guidance, and comprehensive after-sales support. We aim not only to provide high-quality products but also to ensure customers receive timely technical assistance and reliable service throughout the entire usage process. This commitment enables long-term partnerships and mutual success with our global clients.
Moving forward, Shandong E-Way Machine Co., Ltd. will continue to embrace the principles of innovation-driven growth, quality excellence, and service-oriented development. We are committed to advancing intelligent manufacturing, expanding application areas, and improving product efficiency, safety, and sustainability. Together with global partners, we strive to contribute to the continuous progress of the industrial machinery sector and create a smarter, safer, and more efficient future.
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