Self Drilling anchor system use a hollow thread bar with a sacrificial drill bit which is drilled into the ground using grout as a flushing medium. This results in a grout body within the ground containing a high tensile steel bar. Corrosion is taken into account by typically over-specifying the bar with a sacrificial corrosion allowance and/or by the use of special coatings. 

Pile Foundation	Uplift Control	Abutments

Pile foundation systems either consist of single piles or a group of piles which are connected to each other by a pile cap structure. Micro piles are typically used for underpinning of civil structures, especially under limited space conditions or time constraints. By definition, micro piles consist of tubular steel elements with an outer diameter range of approx. 60 - 200 (mm). In general, micro piles act as a passive foundation system. Hollow bar micro piles are installed self drilling, typically using a large-diameter drill bit. Installation is accomplished with rotary or rotary-percussive drilling equipment, depending on the ground conditions and the intended installation length. Filling/grouting of the borehole is either performed simultaneously while drilling or afterwards. The grout serves as bonding medium which transfers the forces to the soil in terms of skin friction. Larger grout coverage also enhances the corrosion protection of the system.