Self drilling anchor bars with cold-rolled rope or trapezoidal threads, extendable to any length using couplers and fitted with drill bits, have been used as drill rods in various soils.  Grouted with cement grout, they can remain in the ground as stabilization means as soil or rock nails or micro piles.

• SDA soil nails R25 to R51N

Soil nailing is a construction method used to maintain or increase the stability of soils by installing reinforcing elements (nails) according to the principles for the execution of geotechnical works. The soil reinforced with nails forms a supporting structure.

The nails are primarily subjected to tensile loads. In addition, bending and shear loads may occur as well. The structure must be so designed that the nailing forms a redundant system. One single nail may not serve as the only load-bearing element.

The principles for the application and execution of soil nail systems are specified in the application standard EN 14490: Soil nailing, and include information on the installation of soil nails, soil investigations, construction materials and products, design criteria and installation aspects as well as testing and surveillance of soil nail production. In addition, requirements regarding surface preparation, drainage and facing are discussed as well.

• SDA rock nails R25 to R51N

Similar in design to soil nails, rock nails serve to stabilize fractured and fissured rock.

• SDA micro-piles R32N to T111N

The piles are suitable to bridge soil layers with low load-bearing capacities and to lay foundations in deep load bearing soils. Tension micro piles are also used to protect against uplift, to activate effective soil as ballast. In narrow spaces, they are used to strengthen existing structures.