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.
Installation
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:
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- Drill the hole.
- Replace the drill steel with a driver tool.
- Slide the plate on the tube.
- 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.
Download specifications in pdf format for:
Model SS-33 is 1.3 inches (33 mm) in diameter.
Model SS-39 is 1.5 inches (39 mm) in diameter.
Model SS-46 is 1.8 inches (46 mm) in diameter.
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Friction bolts, also known as split set bolts, are essential components in mining and tunneling for ground support. They provide immediate and reliable reinforcement in various geological conditions. This guide answers the most frequently asked questions about friction bolts, offering insights into their usage, benefits, and installation process.
What is a Friction Bolt?
A friction bolt is a type of ground support anchor used primarily in mining and tunneling operations. It consists of a steel tube with a longitudinal split down its length. When driven into a pre-drilled hole, the tube's split closes, generating frictional resistance along the entire length of the bolt. This friction holds the bolt in place, providing immediate support to the surrounding rock or soil.
How Does a Friction Bolt Work?
The working principle of a friction bolt relies on the interaction between the bolt and the rock or soil surrounding the drilled hole. As the bolt is driven into the hole, the split in the bolt causes it to contract slightly, creating a tight fit. The friction generated between the bolt and the hole walls holds the bolt in place, preventing movement and providing reinforcement. This process ensures immediate support and enhances the stability of the excavation.
33mm Split Set and Friction Bolt for Ground Support
What are the Benefits of Using Friction Bolts?
Friction bolts offer several advantages for ground support applications:
Immediate Support: Friction bolts provide instant reinforcement as soon as they are installed, ensuring the stability of the excavation.
Easy Installation: The installation process is straightforward and requires minimal equipment, making it quick and cost-effective.
Adaptability: Friction bolts can be used in various ground conditions, including hard rock and soft soil, making them versatile for different applications.
Durability: Made from high-strength steel, friction bolts are resistant to corrosion and wear, ensuring long-term performance.
Cost-Effective: Their simple design and ease of installation make friction bolts a cost-effective solution for ground support.
How to Install a Friction Bolt?
Installing a friction bolt involves the following steps:
Drill the Hole: Start by drilling a hole into the rock or soil where the bolt will be installed. The hole diameter should match the bolt size to ensure a tight fit.
Insert the Bolt: Position the friction bolt at the mouth of the drilled hole and start driving it in using a jack leg, stoper drill, or other suitable equipment.
Drive the Bolt: Continue driving the bolt until it is fully inserted. The friction between the bolt and the hole walls will hold the bolt in place, providing immediate support.
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Check the Installation: Ensure that the bolt is securely in place and providing the necessary support. If required, use a torque wrench to verify the bolt's tension.
What are the Common Applications of Friction Bolts?
Friction bolts are widely used in various industries for ground support, including:
Mining: Used to stabilize underground mines, preventing rock falls and ensuring the safety of workers.
Tunneling: Provide support for tunnels during construction, enhancing the stability of the excavation.
Civil Engineering: Used in the construction of underground structures, such as subways and basements, to reinforce the surrounding ground.
Slope Stabilization: Employed in slope stabilization projects to prevent landslides and soil erosion.
Questions and Answers
Q: What materials are friction bolts made from?
Friction bolts are typically made from high-strength steel to ensure durability and resistance to corrosion and wear.
Q: How do I choose the right size friction bolt?
The size of the friction bolt depends on the diameter of the pre-drilled hole and the specific requirements of the ground support application. It is essential to match the bolt size to the hole diameter for optimal performance.
Q: Can friction bolts be used in all ground conditions?
Yes, friction bolts are versatile and can be used in various ground conditions, including hard rock and soft soil. However, the effectiveness may vary based on the specific geological conditions, so proper assessment is crucial.
Q: What is the typical lifespan of a friction bolt?
The lifespan of a friction bolt depends on the environmental conditions and the quality of the material. High-strength steel bolts can last for several years, providing long-term support and stability.
Q: Are there any limitations to using friction bolts?
While friction bolts offer many benefits, they may not be suitable for extremely loose or highly fractured ground conditions where additional support systems might be required.
In conclusion, friction bolts are a reliable and cost-effective solution for ground support in various industries. Understanding their benefits, installation process, and applications can help you make informed decisions to enhance the stability and safety of your projects.
Recommended article:Effortlessly Split Rocks with 39mm Hole Compatible Kit!
•••••> How Split set Rock Bolt and Friction Bolts Work
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.
Installation
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:
- Drill the hole.
- Replace the drill steel with a driver tool.
- Slide the plate on the tube.
- 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.
Download specifications in pdf format for:
Model SS-33 is 1.3 inches (33 mm) in diameter.
Model SS-39 is 1.5 inches (39 mm) in diameter.
Model SS-46 is 1.8 inches (46 mm) in diameter.
(Requires 'Adobe Acrobat Reader' version 4.0 or higher to view.)
Download Adobe Acrobat for Free!
Friction Bolt: Complete Guide to FAQs
Friction bolts, also known as split set bolts, are essential components in mining and tunneling for ground support. They provide immediate and reliable reinforcement in various geological conditions. This guide answers the most frequently asked questions about friction bolts, offering insights into their usage, benefits, and installation process.
What is a Friction Bolt?
A friction bolt is a type of ground support anchor used primarily in mining and tunneling operations. It consists of a steel tube with a longitudinal split down its length. When driven into a pre-drilled hole, the tube's split closes, generating frictional resistance along the entire length of the bolt. This friction holds the bolt in place, providing immediate support to the surrounding rock or soil.
How Does a Friction Bolt Work?
The working principle of a friction bolt relies on the interaction between the bolt and the rock or soil surrounding the drilled hole. As the bolt is driven into the hole, the split in the bolt causes it to contract slightly, creating a tight fit. The friction generated between the bolt and the hole walls holds the bolt in place, preventing movement and providing reinforcement. This process ensures immediate support and enhances the stability of the excavation.
33mm Split Set and Friction Bolt for Ground Support
What are the Benefits of Using Friction Bolts?
Friction bolts offer several advantages for ground support applications:
Immediate Support: Friction bolts provide instant reinforcement as soon as they are installed, ensuring the stability of the excavation.
Easy Installation: The installation process is straightforward and requires minimal equipment, making it quick and cost-effective.
Adaptability: Friction bolts can be used in various ground conditions, including hard rock and soft soil, making them versatile for different applications.
Durability: Made from high-strength steel, friction bolts are resistant to corrosion and wear, ensuring long-term performance.
Cost-Effective: Their simple design and ease of installation make friction bolts a cost-effective solution for ground support.
How to Install a Friction Bolt?
Installing a friction bolt involves the following steps:
Drill the Hole: Start by drilling a hole into the rock or soil where the bolt will be installed. The hole diameter should match the bolt size to ensure a tight fit.
Insert the Bolt: Position the friction bolt at the mouth of the drilled hole and start driving it in using a jack leg, stoper drill, or other suitable equipment.
Drive the Bolt: Continue driving the bolt until it is fully inserted. The friction between the bolt and the hole walls will hold the bolt in place, providing immediate support.
Check the Installation: Ensure that the bolt is securely in place and providing the necessary support. If required, use a torque wrench to verify the bolt's tension.
What are the Common Applications of Friction Bolts?
Friction bolts are widely used in various industries for ground support, including:
Mining: Used to stabilize underground mines, preventing rock falls and ensuring the safety of workers.
Tunneling: Provide support for tunnels during construction, enhancing the stability of the excavation.
Civil Engineering: Used in the construction of underground structures, such as subways and basements, to reinforce the surrounding ground.
Slope Stabilization: Employed in slope stabilization projects to prevent landslides and soil erosion.
Questions and Answers
Q: What materials are friction bolts made from?
Friction bolts are typically made from high-strength steel to ensure durability and resistance to corrosion and wear.
Q: How do I choose the right size friction bolt?
The size of the friction bolt depends on the diameter of the pre-drilled hole and the specific requirements of the ground support application. It is essential to match the bolt size to the hole diameter for optimal performance.
Q: Can friction bolts be used in all ground conditions?
Yes, friction bolts are versatile and can be used in various ground conditions, including hard rock and soft soil. However, the effectiveness may vary based on the specific geological conditions, so proper assessment is crucial.
Q: What is the typical lifespan of a friction bolt?
The lifespan of a friction bolt depends on the environmental conditions and the quality of the material. High-strength steel bolts can last for several years, providing long-term support and stability.
Q: Are there any limitations to using friction bolts?
While friction bolts offer many benefits, they may not be suitable for extremely loose or highly fractured ground conditions where additional support systems might be required.
In conclusion, friction bolts are a reliable and cost-effective solution for ground support in various industries. Understanding their benefits, installation process, and applications can help you make informed decisions to enhance the stability and safety of your projects.
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