Ground anchors (also known s tiebacks) are cement-grouted prestressed tendons installed in in situ soil or rock.
The applied tensile loads is transmitted into the ground and thus stabilize earth retaining structures or provide uplift resistance to structures.
Basic components of a typical ground anchor:
Anchorage set, which consists of an anchor head, a bearing plate and a trumpet
Unbonded prestressing steel tendon
Bonded steel tendon with grout
- Anchorage set transmit the prestressing force from the prestressing steel to the ground surface or the supported structure
- The unbonded steel is prestressed and transfer the resistance from the bond length to the structure
- A smooth plastic sleeve is placed over steel tendon to separate the prestressing steel from surrounding grout
- The bonded steel with grout provides a tensile load to the ground;therefore the bond length should be behind critical slip surface
- Sheaths are corrugated or smooth pipes or tubes to protect the unbonded length from corrosion
- Centralizers are used to ensure the steel strands are in center so that there is enough grout around them Portland cement is commonly used as the hardening agent for the grout
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