What Is a Split Set?

A Split Set is a type of rock bolt commonly used in ground support applications in mining, tunneling, and civil engineering. It is designed to provide reinforcement and stability in rock structures by anchoring unstable rock formations and preventing potential collapses or failures.

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Here's how a Split Set works:

Design: A Split Set consists of a high-strength steel tube, typically around 1.5 to 2.0 meters in length, with longitudinal slots or splits along its length. These splits allow the tube to compress radially when inserted into a drilled hole.

Installation: The Split Set is installed by inserting it into a pre-drilled hole in the rock or excavation face. As the Split Set is pushed into the hole, the rock's radial pressure causes the tube to compress, exerting outward pressure against the walls of the hole.

Anchoring: Once fully inserted, the Split Set locks itself into place within the hole due to the radial pressure exerted by the compressed tube. This creates frictional resistance between the Split Set and the surrounding rock mass, anchoring the unstable rock formation and providing reinforcement.

Support: The Split Set stabilizes the rock mass by redistributing stresses and increasing its overall strength. It helps prevent potential collapses, rockfalls, or other instability events by providing support and containment.

Compatibility: Split Sets are often used in conjunction with other ground support systems such as mesh, shotcrete, or cable bolts to provide comprehensive reinforcement and stability in challenging geological conditions.

Split Sets are valued for their simplicity, reliability, and ease of installation. They are particularly useful in ground conditions where other types of rock bolts may be less effective, such as in fractured or unstable rock formations. Split Sets offers an efficient and cost-effective solution for ground support in mining, tunneling, and civil engineering projects.

Friction bolt(Split sets)

Friction bolt (Split sets)is rollformed into a C shape bolt with slot by high tensile steel band,which one end is tapered

for easily insertingbolt into drillinghole.The other end is welded a ring to hold the bearing plate.

Functions

Friction bolt (Split sets) is a frictional ground support system.When friction bolt is inserted into drilling hole with smaller diameter, the slot partially closes and bolt diameter is compressed, which creates radical forces  on rock roof surface along the whole length and firmly holds the rock.

Features&Advantages

• Made from high strength steel band  

• Immediate frictional Support in axial and radial

• Independent supporting without plate

• Easy for installation

• Simple design,cost saving

• Available in black,cold galvanizing or hot dip galvanized

Mechanical Properties

Technical Data

TRFB33

TRFB39

TRFB42

TRFB47

Drill hole diameter (mm)

30-32

35-38

38-40

43-45.5

Min. Yield strength (kN)

80

90

100

120

135

Min. Tensile strength (kN)

100

120

132

165

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180

Typ. Tensile strength (kN)

120

135

150

180

200

Elongation (A%)

&#;20

&#;20

&#;20

&#;20

Typ. Anchorage (ton/m)

4-6

4-7

5-8

6-10

Bearing plate (mm)

150x150x4

150x150x4

150x150x4.5

150x150x5

Accessories

Bearing plate,Driver,Pull collar.

Length & Package

• Length:450-mm as specified

• Package:100pcs &#; 300pcs each bundle as specified

Applications

• Mines

• Tunnels

• Slopes

• Places where need ground support

How to work

• The nature of ground must be evaluated.

• Choose the proper bit and drill a hole according to bolt diameter,bolt length,and drilling procedure,and length is at least 150mm longer than length of friction bolt.

• Place a plate onto friction bolt (dome against the ring,tapered end at front).

• Friction bolts must be installed as perpendicular to the rock surface.

• Put driver dolly into bolt and drive friction bolt into the hole until the plate is firmly against the rock surface.

• Do not pound on the friction bolt when plate tightly fixes on the rock surface,in order to avoid damage of  

  friction bolt end.

• Pull tests shall be performed to determine initial anchorage of the friction bolts after installation.

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