Split Pro® Friction Bolts
Rock stabilizing system that transfers loads through friction, which consists of a circular tube with grooves that is cone-shaped at the tip and can be inserted via percussion in the drill; the other tip has a welded ring to hold the steel plate. The system applies axial and radial force on the rock immediately after installation.
Benefits
- Anchor bolt for more frequent use and lower cost.
- Easy installation.
- Easy visual inspection of behavior.
- Immediate action on rock mass.
- Load transfer throughout the length of the bolt.
- Requires no additional inputs.
Uses
- Anchor system in underground excavations.
- Overlap of electrowelded mesh.
- As drainage for water effluents.
Hydraulic expansion bolts
Tube welded to the interior and twisted to an omega shape; sealed at one extreme with a sleeve and at the other, with a head containing a hole for high-pressure injections of water that transfer load, via friction, from the rock directly to the anchor without the need for a chemical agent or mechanical support.
Benefits
- Easy and fast installation.
- Wide range of expansion.
- Pressurization takes place remotely.
- Not affected by blasting vibrations.
- Does not require resin or cement applications.
- Provides active and immediate support.
- Can be reinjected.
Uses
- In underground works.
- For conventional and automated installation with bolting equipment for large sections.
- Versatile design and manufacture.
- With simple galvanized-type covering and plastic epoxy-type for more extreme requirements in terms of treatment.
- Autophoretic.
Cable bolts
Manufactured in high-carbon Steel and thermomechanical treated with a low relaxation process comprised of 7 wires, 6 of which are rolled to a seventh into a helicoidal shape. Contains spaced bulbs to ensure better adherence to the grout inside the perforation and as such, offer more resistance to grip and traction.
Benefits
- Safer
- Increase the capacity for load transfer
- Improves control of dilution
- More practical, given that there are no joints
- Less linear weight compared with very long helicoidal rods
- Is not rigid, and can be easily managed in sections with small dimensions
Uses
- As an element of reinforcement in excavations of civil works
- As an anchor bolt that is grouted across the complete length
- To exploit vertical and semi-vertical bodies
- For strapping pillars to recover mineral
Thread bars
Steel rod with steps in the form of a helicoidal thread, which act together with a fixation system that is formed by a perforated steel plaque with a pyramidal dome and a nodular cast iron nut for tightening.
Benefits
- Large capacity to transfer the load in rock mass, facilitating a high degree of adherence and friction.
- Geometric design that permits high performance and easy application with resin or cement.
- Installation does not require sophisticated machinery.
Uses
- As a system of reinforcement in underground excavations or in slopes and tunnels.
- Work where large blocks exist.
- In high stress areas
FRP Bolts
Combine glass fiber with a polymer matrix that can be either polyester resin or epoxy resin. Main characteristics are low weight, high resistance and traction that is even greater than that of steel, resistance to corrosion, flexibility and resistance to magnetic fields.
Benefits
- Light and resistant.
- High resistance to corrosion.
- Easy to handle and quick redimensioning.
- Grout anchor/highly resistant bolt.
- Eliminates steel in crushing and milling mining processes.
Use
- Replaces the helicoidal rod in corrosive environments but is equally or more resistant than comparative products made of steel.
Self-perforating bolts
Are manufactured with a solid rod of steel that has been cold laminated; has an internal, central orifice that permits water flow for perforation or facilitates the introduction of grout fluids or liquid resins to set the bolt.
Benefits
- Greater length for installed anchor
- Quick adjustment given that perforation, installation and anchoring done in one step.
- Capacity to work in small spaces.
- Option to place different heads, depending on the terrain or rock type to be worked on.
- Based on the rock type, can perforate via percussion or rotopercussion.
Uses
- Adequate control of rock mass.
- Application as umbrella-type support with resin or cement injection.
- As an anchor on embankment faces in open-pit mining.
- As temporary support for the floor to secure contention walls in cutting ramps (gallery area in construction).
- To secure the covering of sprayed concrete during tunnel construction with very poor rock conditions.
- For slope cleanup.
