At Ground we are industry leaders in installing, grouting, tensioning and testing of ground anchors, soil nails and mechanical anchors.
Ground anchors are available in many types for use in a variety of applacations including retaining walls, slope stabilisation systems, bridge abutments, rockfall protection, seismic stability and temporary measures.
Anchors we install include:
- Grouted Bar Anchors
- Mechanical Ground Anchors
- Factory Encapsulated Ground Anchors
- Turf Mat Anchors
- Soil Nail
- Self Drilling Anchors
What are ground anchors?
A prestressed grouted ground anchor is a structural element installed in soil or rock that is used to transmit an applied tensile load into the ground.
Grouted ground anchors, referenced to simply as ground anchors, are installed in grout filled drill holes. Grouted ground anchors are also referred to as “tiebacks”. The basic components of a grouted ground anchor include the: (1) anchorage; (2) free stressing (unbonded) length; and (3) bond length.
The anchorage is the combined system of anchor head, bearing plate, and sometimes a trumpet that is capable of transmitting the prestressing force from the prestressingsteel (bar or strand) to the ground surface or the supported structure. The unbonded length is that portion of the prestressing steel that is free to elongate elastically and transfer the resisting force from the bond length to the structure. A bondbreaker is a smooth plastic sleeve that is placed over the tendon in the unbonded length to prevent the prestressing steel from bonding to the surrounding grout. It enables the prestressing steel in the unbonded length to elongate without obstruction during testing and stressing and leaves the prestressing steel unbonded after lock-off.
The tendon bond length is that length of the prestressing steel that is bonded to the grout and is capable of transmitting the applied tensile load into the ground. The anchor bond length should be located behind the critical failure surface.