Split set bolts are friction-based rock stabilization devices used primarily in mining, tunneling, and geotechnical applications. They consist of a high-strength steel tube with a longitudinal slot along its length, allowing it to compress slightly as it is driven into a pre-drilled hole. This compression creates continuous radial contact with the surrounding rock, generating frictional resistance that provides immediate ground support. The bolts feature a tapered leading end for easy insertion and a bearing plate at the exposed end to help distribute loads and enhance stability. Unlike mechanical or resin-anchored bolts, split set bolts require no grout or additional fasteners to function, making them a simple and efficient solution for stabilizing loose rock and preventing collapses. They are commonly used alongside wire mesh, shotcrete, or other reinforcement methods to improve ground control in underground environments. Their ease of installation, cost-effectiveness, and ability to provide instant support make them a widely used choice in rock reinforcement applications.
- Design: Split set bolts are designed as high-strength steel tubes with a longitudinal slot along their entire length. The tapered leading end facilitates easy installation by allowing the bolt to slide smoothly into the hole, while the opposite end is fitted with a steel bearing plate to distribute the load evenly across the rock surface. Split set bolts come in various lengths and diameters, typically ranging from 33mm to 46mm, depending on the specific ground conditions and support requirements. For enhanced reinforcement, they can be used in conjunction with mesh, shotcrete, or grouting materials.
- Applications:
- Mining – Provides ground stabilization in underground mines by preventing rockfalls.
- Tunneling – Supports tunnel walls and ceilings, ensuring safety in excavation sites.
- Civil Engineering – Used in slope stabilization, retaining walls, and rockfall protection systems.
- Dam Construction – Helps reinforce rock masses and prevent displacement.
- Temporary Support – Used in construction projects requiring short-term stabilization before permanent support is installed.
- Materials: High-Strength Steel (Structural or Alloy Steel) – Ensures the bolt can withstand high loads and deformations while maintaining its frictional grip. Galvanized or Coated Steel – Some split set bolts are coated with zinc (galvanized) or other corrosion-resistant materials to enhance longevity, especially in wet or corrosive environments. Steel Bearing Plates – Typically made from the same high-strength steel as the bolt, these plates distribute the load over a larger surface area to enhance ground support.
- Configurations: 18″ to 144″ in length; 33mm to 46mm diameter. Galvanized option