This process has developed considerably in recent years, especially with the advent of hollow stem self-drilling type systems.
Using this drilling technique, the hollow drill rods are drilled into the soil or rock using grout as a flushing medium and then left in-situ to form the anchor tendon.
This system has made the installation process very fast and, in most instances, the additional material cost is outweighed by the time savings achieved.
Ground anchors are typically used to horizontally restrain retaining walls and as anti-floatation restraints for basements and other submerged structures.
They are often used for holding down tall light structures such as windmills and pylons.
Higher tension loads can be developed by the use of conventional drilling and grouting systems followed by the installation of either a prestressing steel anchor bar or a multi-strand tendon.
To achieve an extended design life of the anchors, corrosion protection (either single or double) can be provided to the steel tendon.