In geotechnical and underground construction, efficiency and adaptability are key—especially when working in unstable or water-logged soils. Self drilling anchor bolts (SDAs) offer a powerful solution by integrating drilling, grouting, and anchoring into one seamless process. Their ability to perform in complex ground conditions makes them a preferred choice for engineers across tunneling, mining, and civil infrastructure projects.
Self drilling anchor bolts are hollow, threaded steel bars equipped with a sacrificial drill bit. During installation, grout is injected through the bar’s core while the bolt is drilled into the ground. The bar remains embedded, serving as both the drill rod and the final reinforcement.
Hollow Anchor Bar – Enables grout injection and serves as the structural element.
Drill Bit – Penetrates soil or rock and remains in place.
Couplers & Nuts – Allow bar extension and secure load transfer.
Bearing Plate – Distributes load across the surface.
One-Step Installation – Combines drilling, grouting, and anchoring in a single operation.
No Casing Required – Ideal for loose, collapsing, or fractured ground.
High Bond Strength – Grout fills voids and enhances load transfer.
Time & Labor Savings – Reduces equipment needs and accelerates project timelines.
Versatile Applications – Suitable for both temporary and permanent support.
Tunnel face stabilization
Slope and embankment reinforcement
Soil nailing and ground consolidation
Micropile foundations
Retaining wall support
Portal preparation and radial bolting
When specifying SDAs, engineers should assess:
Thread Type: R-type (rope thread) or T-type (trapezoidal thread) depending on load and soil conditions.
Corrosion Protection: Hot-dip galvanization or epoxy coatings for long-term durability.
Grouting Method: Cementitious grout is standard; resin systems may be used for high-pressure injection.
Bar Size & Load Capacity: Selected based on structural and geotechnical requirements.
Self drilling anchor bolts are redefining how engineers approach ground support. Their ability to simplify installation while delivering robust, long-term reinforcement makes them a trusted solution in complex geotechnical environments.