5 Things About Rock Bolt You Need to Know

Rock bolt, also being called rock anchors, is a support system to reinforce loose, broken, and other unstable soil and rock formations. It can provide a reliable support effect in excavating constructions.

Rock Bolt Types and Specifications


Rock Bolt Types


There are many types of rock bolts to support different conditions.
Full-length bonded anchor: An anchor with the full length of the anchor hole filled with bonding material.
Prestressed Anchor: A prestressed anchor.
Split set: An anchor rod that pushes a thin-walled steel pipe slitted along the longitudinal direction into a borehole smaller than its outer diameter, and uses the steel pipe to generate resistance to the radial pressure of the hole wall to play an anchoring role.
split set
Friction anchor: An anchor that acts as an anchor by the friction between the anchor body and the hole wall.
Mortar bolt: Bonded bolt with cement mortar and fast-hardening cement mortar as anchoring agent.
Cement Coil Anchor: Bonded anchor with cement coil as anchoring agent.06 Resin anchor: Bonded anchor with resin as anchoring agent.

Self-drilling rock bolt

The anchor rod itself has the function of a drilling and drilling rod, which combines hole making, grouting, and anchoring into one, also known as a self-advancing anchor rod.
Self-drilling rock bolts are divided into two types according to the surface thread, R thread, and T thread. The former is in line with international standards to match the commonly used drill rigs. For the T thread rock bolts, the standard of every manufacturer is different from each other.
R38 self drilling rock bolt

Self-Drilling Rock Bolt Specifications

According to the out diameter, the rock bolts include 25mm, 32mm, 38mm, 51mm, and up to 200mm. They can be applied to support different projects. We can choose different product sizes and types according to different engineering requirements.

The stainless steel self-drilling anchor bolt system
One of the self-drilling anchor bolt systems. it has a better anti-corrosion performance and it can resist the corrosion of air and chemical medium. It mainly includes stainless steel anchor bar, stainless steel coupler, stainless steel nut, stainless steel plate, and other stainless steel accessories.

The hot dip galvanizing anchor bolt
It is suitable for geotechnical engineering applications where longer service life is needed and the surrounding environment is complex, such as roads, railways, hydro projects, and other buildings that may be affected by seawater.

The epoxy coating anchor bolt
It is mainly used in industrial and civil construction, general structures and roads, bridges, ports, and docks in humid or corrosive media.

The duplex coating anchor bolt
This is a combination of hot-dip galvanizing and epoxy coating. It is commonly used in the permanent support of hydro-projects, underwater tunnels, subway tunnels, and some important buildings affected by groundwater for a long time. And it is also widely used in harbors, wharves, and offshore buildings that are corroded by seawater.

How Are Rock Bolts Made?

The processing technology of rock bolts varies according to different product categories. When the anti-corrosion performance of the bolt is not considered, its processing technology is: rolling, sawing, chamfering, straightening, coding, oil dipping, deburring, and packing. If the rock bolt needs to be galvanized, its processing technology is very different, including rolling, sawing, chamfering, deburring, galvanizing, and packing.

How to Install the Rock Bolts?

Let's take self-drilling rock bolts as an example.


What Is Rock Bolt Used for?

The rock bolt system is mainly used for tunnel and underground engineering, slope engineering, and ground and foundation engineering. It can be used for pre-construction support and can effectively enhance the stability of soil and rock mass.

Tunnel and Underground Project
It is mainly used for initial support of tunneling. High-pressure grouting is achieved through the hollow bar to strengthen the soil or rock mass to ensure surface stability. The types of support in the tunnel can be divided into fore-piling, radial support, tunnel-face support, locking the foot support, and reinforcement of the tunnel portal.

Slope Stabilization Project
It is mainly used for slope projects with poor geological environments. Slope stabilization is ensured by the entire anchoring system itself being subjected to tensile and shear forces. It can be used as soil nail support, slope protection barrier, falling rock protection, retaining wall, embankment stability, roadbed reinforcement, and other different application scenarios.

slope reinforcement

Ground and Foundation Project
It is mainly used for micropile. Pressure, tension, or periodic loads can be transferred to the surrounding soil, transferring structural loads to the underlying foundation structure and limiting the deformation of the building. It can be used as a new building pile foundation, existing building structure repair, tower foundation, bridge reinforcement, soundproof wall foundation, protective screen pile foundation, anti-floating pile foundation, retaining beam anchoring, and other different structural scenes.

About Sinorock

Sinorock has professional product research and development team which makes customized services available. Sinorock aims to become a famous brand globally in the geotechnical industry and provides a one-stop solution for anchoring products for customers all over the world.

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