Tension elements designed to resist tension forces in the rock, usually made of a steel bar installed in pre-drilled hole and grouted.
Head is the anchor end outside the ground, comprising a plate, a nut, and a bearing plate.
Bonded length is the length that transmits tension forces to the ground.
Spacer is a plastic device, not always used to keep the tendon centered in the drill hole (Fig. 1).
- Ortigao JAR, Brito H (2004) Anchors, bolts and nails, Chapter 11. In: Ortigao JAR, Sayao AFSFJ (eds) Handbook of slope stabilisation. Springer, Heidelburg. www.springeronline.com, 478 p