Self-Drilling Anchor Systems: Overview and Benefits

What is a Self-Drilling Anchor System?

A self-drilling anchor (SDA) system, also referred to as a Self-Drilling Anchor Bolt, serves as an effective bolting solution for challenging ground conditions such as sand, gravel, silt, clay, and soft to medium fractured rock formations. These anchors offer a reliable and productive means of ground stabilization for projects facing unstable conditions.

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Key Components of Self-Drilling Anchor System

Self-drilling anchors consist of six essential components: Hollow Anchor Rods/Hollow Threaded Bar, Sacrificial Drill Bits, Extension Couplings, Bearing Plates, Hexagonal Nuts, and Galvanized Anchors with Coupling Adapters. Each component is designed to facilitate stability and adaptability across various ground conditions.

Hollow Anchor Rods / Hollow Threaded Bar

The hollow anchor rods, commonly known as hollow threaded bars, feature a hollow bore for simultaneous flushing, allowing for drilling and grouting. With a left-hand/right-hand thread design, these rods are compatible with standard drilling tools for efficient installation. Constructed from API-standard, thick-wall steel tubing, they undergo hot-rolling to achieve a standard ISO rope thread profile that enhances yield strength and durability.

Sacrificial Drill Bits

These critical components are designed to remain embedded in the ground after installation and facilitate penetration into soil or rock. Radial flushing holes stabilize the hole during the anchor's driving process, enhancing installation efficiency and productivity.

Couplings

The patented couplings ensure direct energy transmission between each bar, minimizing energy loss while maximizing the percussive force delivered to the drill bit. Each hollow bar is designed for optimal seating within the coupler for effective energy transfer.

Plates

Forged from steel, the plates include a central hole allowing articulation up to seven degrees for flexibility during installation. Each plate is designed to meet the required performance specifications for varying applications.

Hex/Spherical Nuts

High-precision hexagonal nuts are crafted to provide a secure fit and undergo tempering to meet rigorous specifications demanded in underground operations. These nuts significantly enhance the anchoring system's reliability and stability, even amid high-stress conditions.

Galvanized Anchors

Galvanized anchors enhance resistance to corrosion, critical for durability in aggressive environments. Coated with zinc via hot-dip galvanization, these anchors are specially formulated to prolong lifespan despite environmental challenges.

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Installation Process: How Does the Self-Drilling Anchor System Work?

This anchor system is engineered with a hollow steel bar equipped with external threading and a sacrificial drill bit, facilitating straightforward penetration into various soil or rock types. As the anchor is rotated and pushed into the ground, the drill bit progresses ahead, allowing for effective anchoring and grouting simultaneously through the hollow interior for optimal bonding.

Advantages of the Self-Drilling Anchor System

• Simultaneous Drill and Grout Installation: Grout is applied as drilling occurs, allowing for enhanced bonding with the surrounding ground, particularly effective in soft soils.
• Rotary Percussive Drilling: This method provides fast progress and stability.
• Fully Threaded Rod Sections: Continuous threading offers flexibility during installation.
• High Strength Threads: The robust connections support efficient drilling and bonding with the grout.
• Self-Drilling Capability: Adaptable to various ground conditions.
• No Casing Required: Streamlines the installation process.

Applications of the Self-Drilling Anchor System

Appropriate for granular soils and unstable environments, the self-drilling anchor system is suitable for:

• Slope stabilization
• Tunnel support
• Foundation underpinning
• Soil nailing for excavation support
• Retaining wall anchoring
• Embankment stabilization

Choosing a Self-Drilling Anchor System Supplier

When selecting a supplier for self-drilling anchor systems, consider their technological support, in-house manufacturing capabilities, and industry experience to ensure reliability and excellence.