Split Set Stabilizers/ Friction Bolts

Split Set® friction rock stabilizers are manufactured by International Rollforms, Inc. for underground or above ground applications in mines, tunnels, slopes, or wherever reliable ground support is needed. Our friction rock bolts produce superior holding power due to their unique design that exerts pressure against the rock over its full contact length immediately upon installation. When ground shift occurs, our rock bolts conform to the changing ground conditions. The result is a tight grip that actually grows stronger with time and ground movements, providing reliable ground support. Friction Bolts never needs tightening.

Our friction rock stabilizers are a simple system requiring only 2 parts, a tube and bearing plate. Fast, easy installation takes usually less than a minute - just drill and drive. Split Set® stabilizers come in 3 models. They are available in lengths and sizes to meet your needs and are made of standard, galvanized, or stainless steel.

Download specifications in pdf format for:
Model SS-33 is 1.30 inches (33 mm) in diameter.
Model SS-39 is 1.50 inches (39 mm) in diameter.
Model SS-46 is 1.80 inches (46 mm) in diameter.
Model SS-47 is 1.85 inches (47 mm) in diameter.

Our rock stabilization system has a patented "Ring Indexing" feature for determining the length of the installed Split Set®.

Advantages of Using the Split Set® Friction Rock Stabilizer System

  • Fast, easy installation . reduces bolting costs
  • Yieldable support
  • Immediate support
  • Maintains support even if bearing plate is knocked off
  • Proved by millions of installations
  • No mixing, no pressurizing
  • Visual inspection
  • Maintains plate pressure
  • No special equipment needed
  • No torquing or retorquing
  • Loads rock in compression
  • Grip increases with rock shifts
  • Active axial and radial support
  • Minimal stress concentration
  • Simple design
  • Plain, galvanized or stainless steel
  • Effective at any angle
  • Won.t overstress hole
  • Technical assistance by experienced personnel
  • Easier mesh installation
  • One worldwide standard of quality
  • No shelf life limits

Our friction rock stabilization system will save you money on labor, materials and maintenance.


How Split Set® Rock Bolts and Friction Bolts Work

Split Sets are rock bolts with only 2 parts, a tube and matching domed bearing plate. The high strength steel tube is slotted along its length. One end is tapered for easy insertion into a drill hole and the other has a welded ring flange to hold the bearing plate. With the bearing plate in place, the tube is driven into a slightly smaller hole, using the same standard percussion drill that made the hole. As the tube of the rock bolt slides into place, the full length of the slot narrows, causing radial pressure to be exerted against the rock over its full contact length.

Split Set® rock bolts give you a choice of tube and plate sizes.

In the hole, the tube exerts radial pressure against the rock over its full contact length, and also provides immediate plate load support.

Quality Standards Split Set® rock bolts (friction bolts) are manufactured to a highest standard of quality. Rigid standards of quality are achieved by exhaustive quality control, testing and inspection procedures. Detailed drawings specify materials, dimensions, and tolerances. Every Split Set® is identified with model number, length, factory, rolling date, and heat lot of the steel.

Fast, easy installation of our friction rock bolts reduces bolting costs. Rock bolts can be installed quickly, usually in less than a minute, using a jack drill, a stoper, a roof-bolting jumbo, or any other type of drill. Installation can be done in a few easy steps:

  1. Drill the hole.
  2. Replace the drill steel with a driver tool.
  3. Slide the plate on the tube.
  4. Drive the tube in with the drill / drifter

Rock Bolt Pull Tests Prove Sustained Grip

Pull tests help verify the effectiveness of the stabilizers upon installation and over periods of time. Pull collars may be used on selected tubes for later testing.

Utility Hangers
Split Set® utility hangers are available in 18 and 24 inch (46 and 61cm) lengths. They are used to support cables, ductwork, pipes, trolley wires, etc. They are not, however, for ground support, but they offer the same installation advantages as Split Set® stabilizers. Lightweight items such as ventilation tubing may be hung from the loop on the bearing plate.

Easiest Way to Install Screen & Mesh

Split Set® utility hangers can make screen and mesh installation much easier, faster, and safer. After your opening is secured with Split Set® stabilizers, install the mesh all at once by driving Split Set® utility hangers inside the stabilizer tubes.

No new holes are needed. There's no awkward handling of mesh at the end of a long bolt, or under unsupported ground. The mesh screen conforms to the rock tightly. No other rock bolt has these advantages.

Learn how using IR Split Set® rock bolts and utility hangers can save you money on your next job.

Mining and Ground Support
Split Set® friction rock stabilizers are used for underground or surface support in many applications:

Underground Mine Roof Support & Mine Roof Bolting
Every kind of underground mine uses Split Set® friction rock bolts for mining and ground support. Miners use them for mine roof bolting and mine roof support as well as to pin mesh, hang conveyors, hold pipes, and cables, secure rails in place, and for other needs.

Ground Support for Tunnels and Other Excavations
Split Set® stabilizers have solved many problems for contractors in construction and in maintaining railway and road tunnels, hydropower tunnels, powerhouse and storage caverns, shafts, water and sewage tunnels, and others.

Ground Support for Surface Jobs
Split Sets are being used more often for above ground applications or anywhere reliable ground stabilization is needed. Open-pit mine and quarry operators use them to stabilize high walls for the most effective mine and ground support. Open-pit miners find that using Split Set® stabilizers with mesh can permit a steeper mining angle, reducing overburden removal.

Contractors find Split Set® friction rock stabilizers ideal for attaching screen to control spalling cuts. Construction contractors use them with mesh to tie back the ground and contain rock falls on steep highway cuts, as well as in building excavations.

Varied Applications for Split Set® Rock Bolt Systems where Stabilize, Hold and Control are Necessary

  • Mine roof and ribs
  • Pillars
  • Water tunnels
  • Shaft walls
  • Sewage tunnels
  • Underground storage caverns
  • Road tunnels
  • Pipe and ventilation ducts
  • Conveyor belts
  • Trolley wires
  • Surface excavation slopes
  • Highway cuts

Contact us for examples of applications where the Split Set® friction rock stabilizers utilized in mining and ground support have also solved problems for contractors working on tunnels, sewers, reservoirs, quarries and other rock and mine support areas.


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