The Self drilling hollow anchor system (also named SDA / IBO) is comprised of a hollow threaded bar with an attached drill bit that performs drilling, anchoring and grouting in a single operation. The hollow Bar (self drilling anchor bar) is a fully threaded self-drilling system installed into loose or collapsing soils without the need for casing. The hollow anchor bar allows air and water to freely pass through the bar during drilling to remove debris and then allow grout to be injected immediately after drilling is completed. Grout fills the hollow anchor bar and completely covers the entire bolt. Couplers can be used to join hollow bars and extend the bolt length while nuts and plates are used to provide the required tension. The Self-Drilling Hollow Bars are known for their excellent load capacity and are available in diameters from 25mm to 103 mm.
The hollow anchor bar incorporates a thread for standard rotary percussive drilling. Manufactured from high grade steel tubing, and Hollow anchor Bar is cold rolled to form standard Rope thread or “T” thread profiles. The Drill rolling process refines the grain structure of the steel, increasing the yield strength and producing a robust drill steel suitable for a range of drilling and grouting applications.
The Hollow Anchor Bar System includes a full range of drill bits, adaptor sleeves, couplers, nuts and bearing plates.
Key Features
■ Bars can be drilled into loose or collapsing soils without the need for a casing to support the borehole.
■ Continuous thread ensures that rods can be cut and coupled at any point, or extended.
■ Grout is injected at all points of the borehole as drilling is advanced, permeating the local strata for increased bond performance and producing bulbing in softer sections of the soil.
■ The self-drilling function enables bars to be drilled into most ground conditions for both tension or compression applications, and is also used as an injection conduit.
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