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Self Drilling Anchor Bolts are a bolting solution for unstable ground conditions such as sand, gravel, silt, and clays, and in soft to medium fractured rock formations.For projects facing such ground conditions, self-drilling anchors should be considered as the main productivity solution. Self-Drilling Anchors from Sigricare Anchoring are designed for optimized installation, tailored to the project’s needs.By drilling a hole in collapsing soil or loose rock, with a sacrificial drill bit and a hollow rod, and after the drilling operation injecting cementitious grout or resin into the hollow rod and surrounding cavity, self-drilling anchors are a top productivity solution.

SDA Anchor Components

Hollow anchor rods The anchor rod features a hollow bore for flushing, or simultaneous drilling and grouting, and has a left-hand thread for connection to standard drill tooling. It is manufactured from API standard thick wall steel tubing, cold rolled to a standard ISO rope thread profile. The rolling process refines the crystaline structure of the steel, increasing the yield strength, and producing a durable drill rod suitable for a wide range of applications. The standard rope thread of the anchor rod produces an excellent bond between the rod and grout, as well as enabling connection to the drilling rigs and a wide range of drill steel accessories

Extension couplings The coupling features a patented design that enables direct endto-end energy transmission between each bar, reducing losses and ensuring maximum percussive energy at the drill bit. To enable the correct seating of each bar within the coupler, all bars are chamfered with precision to enable the bar ends to have face-to-face contact.

Bearing plates

The bearing plates are forged steel plates with a center hole, allowing articulation of seven degrees in all directions.

Hexagonal nuts

The hexagonal nuts are manufactured from high precision steel with chamfered edges on both ends from high precision steel, and tempered to meet the stringent demands on anchor specifications and the daily operations of underground work. All nuts exceed the ultimate strength of the bar.

Galvanized anchors

Corrosion is a very complex process, and corrosion rates are very hard to predict accurately. However, analytical evaluations can be helpful to recommend the need for corrosion protected rock bolts. For this reason, Sigricare Anchoring has developed a hot dip galvanizing corrosion protection. The full range of SDA bars and accessories is available with this corrosion protection.

SDA Applications

· New construction

· Underpinning

· Settlement/stabilization

· Earth retention

· Slope stabilization

· Tunneling

Benefits of Self-Drilling Anchors

· Difficult soil conditions

· High installation rate

· Limited access

· No casing required

· Extra corrosion protection

· Decreased labor & material cost

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