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A hollow bar self-drilling anchor consists of
A hex nut
A bearing plate
A coupling sleeve which enables the flexibility in length by using the sleeve
Hollow anchor bar
A sacrificial drill bit

Field of Application
Self-drilling anchors are successfully used for anchoring in poor ground, cohesive and non-cohesive soils, and in case of unstable boreholes. Main applications are:
Tunneling and Mining
rock bolting
face anchoring
reinforcement ahead of the tunnel face - forepiling
foot piles
tunnel portals, trenches, and cut and cover areals
Special foundations
reinforcement of excavation pits, dams, and slopes - grouted anchors
anchorage of retaining walls and noise barriers
pile foundation and buoyancy control - grouted piles
Avalanche protection structures
anchorage of avalanche barriers